Your buddy is misleading you and him by saying to much volume or pressure is causing your problem, If it had to much of either it would flood over out of the carb. and die and be hard to start, if it would start work
What color are your spark plugs? White, brown or black? If black it is to rich so it needs leaning down on the mixture, you can do that with the metering rods( you may need to change the primary jet if you can't get it right with the rod changing) and changing the accelerator pump squirter sizes also scope
Good luck scope
The AVS carbs are a different type of carb and tuning the secondary part can be challenging, you said the 750 did the same so it may be time to focus on fixing that problem, start by making sure the secondary air door (the big one covering the rear of the carb that is spring loaded) opens properly scope wrench

Last edited by Cab_Burge; 08/12/19 05:32 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)