If I was running a Top Dragster type build.........I’d definitely save myself a lot of aggravation(and $$$$$ ?)........and run something like an SR20 or Big Chief combo.
At least until the whole block unavailability situation got resolved.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads