An 8.2cr 360 Mirada with 200cfm 1.88 valve heads, stock intake, TQ, and about a .420 lift cam will run 11.70's in nhra Stock.

It doesn't seem like at low 12's you're getting the most out of a 408, ported aftermarket heads, hyd roller and 1.6 rockers.

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