mine is 12.5-1 540 ci with 270s, Comp 665 roller with a single 1250 E-85 dominator in a 2600 pound street car. Drove it down the road I live on once so far. Figuring out a few minor issues. Valve covers were not flat, had to get them milled and had the wrong coil on it. Hopefully this weekend will be good enough to get it close enough to go make a few passes at the track. Been saying a prayer every night!!! Birdtracker