So I know there are a bunch of different ones, is there a website that sorts it all out or would someone on here like to illuminate. I have two different sets that came off the same 64 352 in two diff cars. I'd have to go back to the shop and double check the numbers but when I got my most recent car, I noticed that the heads were diff numbers. Just wondering what I have and what to look for at those swap meets coming up this year. Thanks in advance