If you are going to Steal a High Horsepower Heavy Duty Pontiac M-22 you will also have to swap out the Fine Spline Clutch Disk for a Run of the Mill Clutch. Now, Pontiac did not do this. Most Heavy Duty High Horsepower Engines got matching Heavy Duty High Horsepower sustaining Muncie Transmissions. Why would you give some body a weak tranny to break so you could replace it over and over again?