[&:] just picked up a pontiac 455. was going to put in my 1969 firebird, but it turns out that the moter is a 455 ho casting nuber 9799140 front of the moter reads 0339772 YH as far as i can tell it's a b body 360 hp ho. my question is should i put in my bird or is it worth more for somebody who is restoring a b body. also should that moter have 4 bolt mains because it does not.