I agree with others, you shld have more in that combo you have. The combo I have in my 74 cuda is pretty mild with stock suspension and run 11.50 @ 117 mph. 446, with stock rods
30 over
trw 2355 pistons W/10.5 comp.
hughes solid flat tappet 252/256, 572/279 @108
victor int
mghty demon 850
indy EZ's (with just a port match)
Hooker 1-7/8 headers
3.91 with M/T ET.radials (275/60/15)
TCI 10'stall 3500-3800
With some more suspension upgrades I feel confident it will run 11.20-30's