Fuel pressure dropping while driving and under acceleration to zero at idle runs 4 lb electric Blue

Keep the Carter carb psi (In post 5) under 5. You wont need to boost reference a draw through carb on top of a supercharger. You could be seeing vaporization of fuel in the line messing with the pressure. Do you have your fuel filter vertical to the carbs? In that way the vapor wont stay in the filter but will seek its highest point, hopefully the carb bowls. I'd make sure you tank is vented too.