I done a few TKO's in the 71-up B body over the years, the TKX is a much more compact transmission, case wise compared to the TKO which has a very tall profile, most owners refused to cut the floor to get the proper driveline angle, plus they applied "old school" 3/4spd experience/knowledge, or lack there of, during a Tremec install, that's why most had poor to moderate success in their install/operation/performance, I do recommend before you remove your existing transmission, measure the tail shaft center line/driveline angle to any reference point of your choosing that won't get modified, so that you can reference where the TKX tail shaft centerline height falls after install, and modify, if needed, to obtain that same geometry, do dial in your bellhousing to the crank centerline, that's a must!......I'd recommend Silver Sport/SST to source your kit/parts/advice


MikeG