650cfm QFT Carb Tuning / 383 / 727

a 650 should only need a 31 or 33 nozzle. Single plain manifolds normally need more pump shot. Dialing in pump cams and nozzles is best done at the track using 60' times, or butt dyno if no track time. Use the smallest amount of pump shot required to transition, it's all test and tune.
My car 340 Demon 650dp likes 31/31 white cam #2 hole throttle/cam up front, and pink #1 rear. I launch at 2k at the track.