Dave, what have you put in the engine to make power up any higher? What trans do you have,and what gear do you run it in? I built a very healthy 355,ran on1/4 mi. dirt and asphalt, found it ran the quickest with a wide ratio powerglide,in low gear with 3.73 rear end.We even took it to a 3/8 mile,and it buzzed up pretty high there. Didn't bother with a tach,he wouldn't look at it anyway. Hank