Does anyone have any proof as to what kinda power longtubes are worth over shortys on say a 400hp street car? I'm not talking about the expensive custom race headers, i'm talking (for example) a mac shorty header vs a mac longtube. I'm looking for dyno and track numbers. Reason I'm asking also is because I have a mcleod sfi bell and the fit is tight with longtubes so in the event down the road I ever have to drop the trans, its gonna be a nightmare. So, i'm wondering if its worth the hassle to do 1 3/4" longtubes or just use 1 3/4" shortys? I KNOW longtubes are overall better for power, i'm just wondring if its worth the hassle if I keep my sfi bellhousing and don't sell it. Also looking for examples of gains on a car like mine, not a stock 14 second 302.