66 Plymouth Valiant help!

Lets not get to twisted. Easy stuff, here is the conversion chart from Moparts. Here is a good link. Just about every A body rear will fit, some with modification. I have a 8 3/4 under my 65 Valiant, sure grip 15inch rims 205/75's.

http://www.moparts.org/Tech/Archive/axle/6.html
http://www.moparts.org/Tech/Archive/axle/17.html