So, I thought I was running out of fuel around 4000ish rpm. I replaced fuel pump and a section of squishy rubber hosefeeding the pump and I also replaced hard line to carb with a nifty 3/8 hydraulic hose and fittings that may not appeal to purists, but has a cool industrial look to it and is very hearty (heat, vibration etc). Vastly improved, pulls harder with no stumble at 4-5000, but gets soft above that. Valve springs are plenty good, so not a float issue. What I do have is stock air cleaner with a 2" element, 11 inches across. Roller cam is 540 lift and 240ish@ .050, peak power @ 6000 rpm, 110 lobe sep. RPM intake, 195 heads, Quadrajet. Am I running out of air? I still havent found a drop base air cleaner that will let me use a 3" x 14" filter element, and my hood barely closes now. If I stay out of the secondaries, response and rpm are awesome. Secondaries feel like rocket power until 5000ish. Brent.