You won't know how much power the motor will make until you run it I have made 430 HP with a mild 440 stock 446 C.I. iron headed pump gas street motor with a six pack on a DTS engine dyno. I have also made 535 HP with a 451 C.I. 440( .055 over bore) motor with ported big valve pump gas iron heads and a lot bigger solid lifter camshaft with a single 850 Holey D.P. carb.
Cam timing, jetting, exhaust system and a bunch of other things end up helping or hurting how much power a motor can make
I've seen 80 HP loss and gain by changing the cam timing(going from 5 degrees advanced to two degrees retarded) on a engine dyno test
The 4.10 gears in that car will make you wonder were all the power came from
Drive it first with the 2.76 and then the 4.10