10" Rim with 4 and 7/8 or 5 back. 8.5 with 4.25 or 4.5 with small spacer if you must. Our Volare/Aspen combo has HUGE fenderwells by comparisions. Mopar makes a spring hanger that is .8" narrower that will bolt in A Body..... you might try that, it looks stock if you are good at rewelding spring hanger on housing but it probably is not legal but not very noticable.
