Power valves..

What makes for better delivery of fuel, through the mains or through a power valve? Debating on pulling my pv on the primary side out, and square jetting. Also when adjusting a square jetted carb, do you need to keep all mains the same? Like, if 80's all around was a little fat, do you need to go to all 79's? Or could you try 80's rear 79's front? This will be a mud race deal. Idles only to warm up.

found some really good reading!...It may help in your question......really good info and tech.

http://www.florida4x4.com/tech/quadrajet/qtune.pdf