I don't think the fuel supply system on the pressure side, past the fuel pump is likely the problem. I have owned a number of 421 HO tri-power cars, a 2+2 and a 9 passenger wagon, and neither of them had any fuel starvation issues in a 1/4 mile drag race. The 2+2 ran 13.60's @ 105 with stock 5/16 fuel lines between the carbs. 3/8" from pump to the first carb. Rochester 2-jets, each 1 has a fuel bowl nearly as large as a Q-jet. So you have almost 3 times as much fuel on hand. I would make sure your ignition system is top notch and the valve springs are not beginning to float in the 5000 RPM range. My 9 passenger wagon ran 14.50's @ 96 MPH at 5050 Lbs. I pulled a 19' Sea Ray with it every summer for over 12 years and can't recall any fuel delivery issues. Check the rubber fuel hoses from the tank to the fuel pump. Make sure they are not being sucked closed.
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