Help on 340 combo

:banghead:Hi i am new hear and have a 67 cuda with a 340 that i cant git to run up to its full abillaty. so far i have run a 7.88 at 87 mph 1/8 mile with a slow 60 ft 1.72 the motor is .040 over forged pistons,h beam rods,steel crank, also i converted it over to magnum heads with 1.6 roller rockers drilled the heads for la intakes and i am running a vitor with a 750 hp carb the cam is a hughs solid lift flat tapet cant remember all the specs but i think it is 262 dur. with a 612 lift in and 614 exh. 106 center line msd dist, 6al box the comp. is 11.2 to 1 ,727 trans with a ptc 4000 stall convr. also a 8 3/4 rear with a 4.56 gear 26-9-15 mt slicks, car with me is at 3000 pounds. anny ideas? :banghead:

That cam is way too large. You need something closer to 250 @ .050 or more compression to run that cam.
5000 8" converter is the bare minimum converter I'd run. A 1" tapered spacer will help as well.
Without changing the cam or converter it'll always under perform (minus the NOS!).
Brian