I run a 318. It's .030 over stock bottom end. Engine Quest heads with LS1 type beehive springs and retainers. Comp XE268H cam. Has 4.10 gears and 26 x 10.5 ET Streets. Shift kit in the A904. The best it ran with the stock convertor was 13.72 and the best MPH was 101. The car weighs about 3700 with me in it. This winter I'm getting the right stall convertor and fixing the trans cause it slips into second now. I also figure I'll gain a bit by freshening up the brakes on the front cause they are REAL sticky, I can't even turn the wheels by hand. I think that's killing some mph. I'm a strong believer in the wee18