Need help identifying a Holley 1920 Carb

So, I'm a bit new to this and having some trouble finding the right info to replace my Holley 1920 Carb. Please excuse any stupid questions in advance, and thanks for your help.

I have a 65 Valiant, slant 6 (but it originally had an an 8 in there).

The numbers on the top of the fuel bowl are:
(6)
3229 2S 0151
2658467

The stamped number on the side is:
12R-3106B


I'm having a hard time finding a replacement, especially because this isn't the original engine, and I'm a little unsure of what year the engine is (because the numbers there are a bit inconclusive). Does that even matter, or will any carb that works with my year car work with whatever slant 6 can fit in there?

I feel like I'm taking crazy pills.

Holley_Side.JPG

Holley_Top.JPG