Go to Passon Performance, or Brewers Performance websites. The easiest way is to get the correct bell housing. 75 up A or F body. It will be for a 10.5 clutch, 130 tooth flywheel. To get it to work in your early A, you will need a conversion Z bar, bell housing pivot bracket, and threaded adjuster rod. The bell housing will fit without body mods. The O/D will work fine in an early A. Is it a manual car now?
