Straight from a very well known carb MFG. " When your car isn't performing, alswys carry out the gas can test first - it's one of the least expensive diagnostic aids you will encuonter. Keep in mind that valve springs, ignition systems, torque convertors, even engines have been changed, when all the time the fuel system was at fault". I give on the line size ( but it's too small ) - if you wanna run in the 12's, your gonna have to fill a 1 gallon can in 35 seconds or less - from Barry Grant, Holley, and others. If you can do it with a 5/16" line, God bless you! Hope everyone remembers this thread when there motor goes lean through the second MPH lights and sections of the top ring lands on their hypereutectic pistons start exiting out their collectors! Been there - done that!!!!!! Here is a web sight with a ton of really good on line calculators: http://www.csgnetwork.com/compcalc.html