I was running a 360/380 hp crate motor in my D50 and the short block except for cam is a stock Magnum. It has the .501/.513 hydraulic roller cam. It ran its quickest ET shifting at 5600 rpm. If I went any higher it would nose down and slow down. Ran a best of 7.27 @ 94 mph in the 1/8 at 2950lbs. Through the mufflers and Drag Radials driven to the track.