I'm running an Edelbrock 1411 750cfm on top of a offy intake, otherwise stock. The car will stumble/stall off the line, I have tuned the carb and even tried the metering rod/jetting kit to no avail. I'm thinking of going with an Edelbrock Thunder 650 AVS. Any suggestions? This is a repost, I had it in the holley section by accident.