Decent handling susp setup?

I have the 1972 Dodge Demon been doing a lot of upgrades as everyone does with the old Mopars. Disc brakes all around better braking, Hotchkis leafs in the back to lower the rear of car, stock a body 8 3/4 rear up grade on the axles 5 4.5 and front disc for the better choice of tires (sounds like 18's are the way to go). Hotchkis sway bars front and back. Having trouble deciding on torsion bar size? Any ideas would be helpful with the set up I'm have. QA1 upper and lower front, stock k frame small V8 no Big Block and the motor is a 318 with 30 over 302 casting heads with the biggest valves the heads can handle and thin mopar head gaskets with that being said ( of course headers 2.5 exhaust pipes) question is have not choose a carb for the motor. Any Ideas would help on that to Holly verses Edelbrock ect Thanks in advance