Srt-68 Barracuda
I see that you figured out the speed sensor/ABS issue on the trans, but another option that may be readily available is a newer truck Dana 60 rear. They have the tone sensor on the ring gear. Just cut the truck ends off and have car ends installed at the correct A-Body width, and A-Body axles.
Great build by the way, just read the whole thing. I love both the cars you did and look forward to reading the next one.
momoparman... love the harassment, I couldn't have done it better myself. I hate when people start taking it personally and get tough with their keyboards... they don't realize its all in good fun.