I find that my engine has alot of pull for the high gears I'm running(2:76) and I can get up to around 90 very quickly, but in lower gear if I'm trying to turn the engine to 5,000 rpm"s for better time at the track, at 4500 RPM"S which is around 95, it just barely climbs above the figure. In better perspective I don't have a shift kit in my 350 tranny and it shifts at 4,000 RPM'S. If i keep it in a lower gear I 'm trying to increase my RPM'S just like a shift kit would do. My engine should turn 5500 with no problem but with my head issue, I'm just NOT getting the air I need.