66 Dart GT HT Whatsitgonnabe?

Why not bolt it up stock, and see how it does. Then add shims if needed. If you want a real driveshaft nightmare try a 1960 full size chevrolet passenger car with an X frame. It has a 2 piece driveshaft, 3 u joints, a hangar bearing in the middle, and a shim stack for the single upper control arm for the rear axle to adjust pinion angle. This car uses coil springs in the rear , with a panhard bar.