sorry i'm a small block guy.
i just came across this 90 454 and these 70 heads and thought can i make it work? iv'e done small block ls1-lt1 carb conversions and that went well so why not a big block..
the block is a mark 5 one piece r-main seal
the heads are out getting cleaned up by a buddy and i'll post the casting # when they get back.the ports and valves are huge compared to other big block heads iv'e seen . this guy told me they were race heads. i would like to know where they came from. is there some place i can get that info with the casting #..thanks again guys . this site is sweet