the bolt pattern on 70-90s chevy 8 lug is same as a 59 8 lug the only thing you need to watch out for is the back spacing on the newer rims, i haven't really heard of it being on a problem on the 55 2nd - 59 but on the 55 1st and earlier you run into the problem of the new rims have to much back spacing and the hit the tie rod end, i'm sure someone else will come along with more info
Nate
