Originally Posted by Cab_Burge
Every B/RB motor, regardless of cubic inches, that I've added cfm on the intake side of the motors made more power at the drag strip and on the engine dyno up work
Swap 600 CFM carb to a 750, then an 850 and finally a intake and carb change to a 1050 CFM Dominator on a stock bore and stroke 440 bracket motor, jetted for best ET and MPH up
Same thing on more than one engine dyno tests, started testing with a 600 CFM carb and ended up with a tunnel ram intake with two 1060 CFM Dominators shock up boogie
Stupid Mopar wedge motors whistling grin


OP has a very mild 440 engine. It isn't going to pick up much power on the dyno with a bigger carb. It will only use about 550 cfm at WOT so a bigger carb isn't going to add much power. Might pick up 5 hp with a 750 carb. It would still drive okay with a 750 carb, especially if it has vac secondaries. I doubt it would pick up power with an 850 over a 750. Very likely that it would start to be a bit soft off throttle with a 850 Holley, depends a bit on the gear ratio out back. A Thermoquad or QJet could be made to work on that engine but the secondaries would most likely never open all the way.