I had once bolted a Marine dual quad intake on a 440 with 2 brand new 625cfm Carter carbs, and that engine was a blast to drive.
Just some tweaking of the idle mixture screws was enough to get them to idle nicely. No issues whatsoever.




Many years later I installed two 650 used but otherwise equal Carter/Edelbrocks on a 354ci Chrysler poly-engine with a 392ci Hemi dual quad intake, and the engine ran very rich and backfired at the same time occassionaly. The carbs where jetted equally and checked for vacuumleaks but none were found. Something was not happy in that setup. After a while I switched back to a single carb as I just wanted to drive the car at the time.