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I've got a 440 with low idle vacuum that's always had Edelbrock carbs and an off idle stumble. I just converted it to a 4sp and the stumble made it a real POS to drive. When I had the auto trans I spent many days tuning on the Edelbrock 750 and 800 carbs without getting the stumble completely out. Backing the timing down made the biggest improvement in the stumble, but that also cost a bit of power.
I put a Street Demon 750 on last night and the stumble was gone! I can come out on the clutch at low rpm and pull off with no problems. It's incredible how much better the car is to drive now. I set the carb up with the weakest springs from the set and put the pump shot to max, bolted it on and it was like magic.



So NOW do we want to talk about how long ago I told you to get a Holley?

"IF YOU'RE UNDER CONTROL, YOU AIN'T GOING FAST ENOUGH."