[b-man]

It’s not just the smaller bolt pattern.

The 4.75” bolt circle wheels also have a smaller center bore, the front drum hubs and rear axles would need to be turned down to match the new wheels.

I ran into this issue myself when I converted some 1979 12” B-body rotors to 4.75” bolt circle, had to turn down the hubs so the GM intermediate wheels would fit.

Really not worth it in my opinion unless you can get the machine work done cheap or free.