I just installed THIS B&M Transpak Shift kit. I set it up for performance street. My motor and transmission won't be going in the car for another week or two. I also went with THIS B&M Holeshot 2000 RPM Stall Converter.

When I was installing the Transpak Shift kit which was very easy because of the highly detailed instructions. There was a small spring that go's in where the vacuum modulator valve go's when it's set up for heavy duty use instead of performance street use. They said it lowers the part throttle shift points by 5-6 MPH. I'm going to call B&M to see if I can install it with the performance street set up. I know they make adjustable vacuum modulators for this.