Also have a 67 Belvedere,

Steel crank 440, 270/470 comp Hyd. cam, stock rockers and pushrods, Stealth cnc ported aluminum heads, RMVB 727, 2.76 sure grip 8 3/4 M-1, 850 DP holley, carter mech pump, 1 3/4 headers, 2 1/2" full exhaust out the back.

I easily have double in this car what I have in the other one, with a 3.54 Dana 60 ready to install, among other upgrades. It's ran 13.50-105 on motor, and 11.58-114 with it's Big shot plate system.