The BOSS 302 was only a wedge chamber engine. The heads were from a 4V 351C engine but it has different coolant ports from a regular 351C. And Oldsmobile didnt come out with the 455 until late 65 into 66 model years. One thing that is good when knowing more than just one manufacturer is more people will come to you for knowing certain things therefore you will either earn more money if you have a business or you will just get recognized as a knowledeable individual at least thats what I think anyways. I myself specialize in Ford but I would also like to know what others have going on so Im not left in the dark when people are talking about other things from Chevy or dodge or pontiac etc etc.