Frame or chassis options for A bodies

If I was going to put a A-body on a track I would go torsion bar leaf. Leafs are great for acceleration and traction and the torsion bars work well with the leafs.
Some of the things I would pay attention to:
You need to know what your car weighs how it is distributed and
the center of gravity. The lower and closer to center
the weight is in your car the faster and flater your car can go thru a turn.
You may not end up with 50/50 frt to rear but you can get real close if you keep this in mind
while choosing and placing parts in your car. Shoot for a center of gravity close to12".
Solid greasable bushings frt and rear. Delrin is a good choice for most as aluminum would hammer out and need replaced more often. Steel in the front leaf spring eyes. They can be drilled to lighten them some.
300 lb/in. front torsion bar rate. 125 lb/in. rear leafs. 450 lb./in. front sway bar. No rear bar.
8" &10" width wheels. 4.10 - 4.88:1 gear.
11.75 front disk 11" drums rear brakes.
16:1 manual steering box.
Lower front roll center to 3 or 4 in. 5°+caster 1°-camber 3/32" toe out.
Control fluid weight. Oil pan and fuel tank baffles.
This would be stiffer than you would want on the street. You would need to glue all your
dash screws in place. And check the car often for loose fasteners and stressed sheet metal.
Run over a dime and you could tell if it was heads or tails.