3.6 in A-body
@Gina Grahame there is a popular swap that will work great for your car. A Ford 8.8 out of an explorer with one side narrowed to center the diff. You get disk brakes, strong parts, (31 spline axles), limited slip diff and good gear ratios. 3:73-4:10. Lots of people using them in A bodies. Do a search here for 8.8 Ford diff and start reading. Best part is they’re cheap. Junkyard prices with race car level of parts. Oh and start a thread on your build so we can follow along.