Finding the right set of gaskets for my 1975 Datsun 620 truck

Hi, I am fixing the carburetor on my Datsun 620 and I have been doing some research. First of all, I found out that my carburetor (original type, Hitachi) is not for a 1975 Datsun, Its either for the 1972, 73, or 74, but Im not sure yet. My carburetor has busted threads all around, so I can either re-thread them or buy a new one. I might try doing both.

So far I am looking at an item on ebay and they say that this particular carburetor (DCH340 carburetor) fits many different vehicles and it is a stock carburetor. I am assuming that if I get a carburetor from any of these vehicles I will be able to swap it into my truck and have it running.
Here is the list:

Notes

Year

Make

Model

Trim

Engine

	1986	Nissan	720	Base Standard Cab Pickup 2-Door	2.0L 1952CC l4 GAS SOHC Naturally Aspirated
	1985	Nissan	720	Base Standard Cab Pickup 2-Door	2.0L 1952CC l4 GAS SOHC Naturally Aspirated
	1984	Nissan	720	Base Standard Cab Pickup 2-Door	2.0L 1952CC l4 GAS SOHC Naturally Aspirated
	1983	Nissan	720	Base Standard Cab Pickup 2-Door	2.0L 1952CC l4 GAS SOHC Naturally Aspirated
	1982	Chevrolet	LUV	Base Standard Cab Pickup 2-Door	1.8L 111Cu. In. l4 GAS SOHC Naturally Aspirated
	1981	Chevrolet	LUV	Base Standard Cab Pickup 2-Door	1.8L 111Cu. In. l4 GAS SOHC Naturally Aspirated
	1980	Chevrolet	LUV	Base Standard Cab Pickup 2-Door	1.8L 111Cu. In. l4 GAS SOHC Naturally Aspirated
	1980	Nissan	720	Base Standard Cab Pickup 2-Door	2.0L 1952CC l4 GAS SOHC Naturally Aspirated
	1979	Chevrolet	LUV	Base Standard Cab Pickup 2-Door	1.8L 111Cu. In. l4 GAS SOHC Naturally Aspirated
	1979	Nissan	620	All	All
	1978	Chevrolet	LUV	Base Standard Cab Pickup 2-Door	1.8L 111Cu. In. l4 GAS SOHC Naturally Aspirated
	1978	Nissan	620	All	All
	1977	Chevrolet	LUV	Base Standard Cab Pickup 2-Door	1.8L 111Cu. In. l4 GAS SOHC Naturally Aspirated
	1977	Nissan	620	All	All
	1976	Chevrolet	LUV	Base Standard Cab Pickup 2-Door	1.8L 111Cu. In. l4 GAS SOHC Naturally Aspirated
	1976	Nissan	620	All	All
	1975	Chevrolet	LUV	Base Standard Cab Pickup 2-Door	1.8L 111Cu. In. l4 GAS SOHC Naturally Aspirated
	1975	Nissan	620	All	All
	1974	Nissan	620 Pickup	All	All
	1973	Nissan	620 Pickup	All	All

Notes

Year

Make

Model

Trim

Engine

1972

Nissan

620 Pickup

All

All

Also, I do not want to spend $300 for a Weber or a high performance engine right now. My current engine is in unknown conditions (it runs but it does need gaskets so far) and I've heard you get poor fuel economy with those expensive carbs. So I can't be running a high performance carb with a low performance engine. I might just blow it up.

These picture are from my carburetor. If anybody recognizes what kind of carb do I have please let me know. I am unfamiliar with carbs.

Disassembled Carburetor, main parts

Carburetor Side view, Hitachi Logo

These are the gaskets that I was trying to replace the one at the left is the new one that came with the kit for the 1975 Datsun 620 and the one at the right is the one I pulled out of my carb. Which carburetor kit should I get?

Gasket 88

I think I made up my mind already and I want to buy the Hitachi DCH340 carburetor. I still don't know what carburetor I have but I think it looks like the DCH340.

*UPDATE 08/13/2013: I went to the wrecking yard today and got the same carburetor that came with my 1975 Datsun 620 from a 1973 Datsun 620. These so far are exactly the same, and none have a part number I can use to identify them. My best guess is that I am and was running a Hitachi DCH340 Carburetor from a 1973 Datsun 620 truck.*

Here is some more info. After doing some more research on Datsun 620's Carburetors, I found out that there are two carburetor kits that I am interested in.
The main reason why I am able to recognize them is because of the gasket that goes in between the "feet" and the "body" of the carburetor (Gasket 88). You can see it in the image where two gaskets appear.

These are the Carburetor gasket kits that have the gasket compatible with the one shown on the right:

1972 Datsun 620
Uses 96-274 Carburetor kit from Autozone
Compatible with Carburetor DAF326, DAH328

1973 Datsun 620
Uses 96-275 Carburetor kit from Autozone
Compatible with Carburetor DCH340

1974 Datsun 620
Uses 96-275 Carburetor kit from Autozone
Compatible with Carburetor DCH340

I have also concluded that the DCH340 style or type of carburetor appears in the Datsun 620 from 1973 to 1978, but these have different carburetor kits, which means that their base, trunk, or head vary. Many parts stay the same but since there are variations you will not be able to rebuild a 1978 carb from a 1973 kit.

Note that I purchased Carburetor kit 96-282B from Autozone and got the wrong gasket (88) for the one shown in the image. Any carburetor kit for a 1975 or newer 620 will not work for me. So I will buy one for an older truck since I think I have an older carburetor. Right now I am leaning towards the 1973 and 1974 since they use the DCH340 carburetor. I am also currently looking for one.

*UPDATE 8/13/2013: I just purchased a carburetor kit from Autozone for a 1973 Datsun 620 truck that will fit my two carburetors*

I just noticed too, DCH340 means DatsunCarburetorHitachi340?

This link contains the image for an exploded view on a DCH340 and the image and location of gasket 88.