I think your guess is pretty close.

I think it would be easy 12's with 3.91's or 4.10's.
Might still do it with 3.23's, but that's not much gear with a 28" tire.

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads