6 Pack vs. 650 4BBL?

Eddie, my opinion and experience is this: I've played plenty of games at the dragstrip with combos similar to yours. I've brought carter 625 AFB's, 3310 Holleys, to try and improve over my 750 dp. NONE could match the E.T. Some came within a .1, but none even could improve on the 60 ft time. Ready for this? The one combo that would run the best against the 750 dp on a LD340 intake was the factory cast intake and Thermoquad. trust me, you need to know how to tune a TQ, but it did the best against the rest.
I do agree, the 3310 would be a nice improvement over your current carb, I'll say I could make the dp improve over it. IF you go vac sec, I really like the 770 Street Avenger.