Sorry I haven't replied before....my wife just had our first little child.

Anyways, I put a 8 3/4 out of a 69 Coronet in it. I think they run about a 1/2" narrower on each side is all, but that seemed to be enough to give clearance for the tires and rims that were on it. I have also noticed there is quite a lip on the inside fender well. I may take a die grinder to that and get another 1/4" or so for room.

I just had to relocate the spring perches for the rear in it. I used the ones off the 56 rear.

Hope that helps.