i have 4.88's & a 32" tyre on a 727 with 5500 stall behind my 512. changing gear @ 7000 & cross the stripe @ 7200 with my window closed or 6900 with the window switch open. 1.34 60's 6.0@112mph @ half track 9.5@139mph 1/4's. is it too much gear? not in my book!