Confused about carbs, need help.
The best way to go would be to buy an Eaton 3series carrrier, Motive 373 ring and Pinion. The GM corporate (big 10) rear is just as heavy duty as that 12 bolt. Get the 30 spline carrier and a pair of moser axles. A Hughes GM40 stall converter will help that cam shaft you have. Try a Holley or Demon 750 DP carburetor with that Victor JR. intake.