I would have checked the idle vacuum, along with the part throttle vacuum in the 2000-2800 range.
Basically, at least initially.......it’s going to come down to you and a converter shop being on the same page about what you’re looking for...... and then seeing how it pans out after it’s in the car.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
