Install a Tremec T56 Magnum in your A-body

Yes. The TKO was built based on the old FORD top loader. Doesn’t shift very well above 4000 RPM.
We did our conversion and designed the parts using our pristine 1969 340-S fastback. The sound of 600 HP banging shifts at 7200 RPM is incredible!! Good luck with the engine/ transmission angle lowering the tail shaft of the transmission. I kept the factory angles consistent in our kit so the pinion angle shouldn’t need to be adjusted to keep from having a horrible rumble due to differing angles between the 2 “U” joints.
Done lifted 4x4's for years. Including high speed off road. No problem with joint angles. You kits good but not for those of us that don't wanna remake the floor. Tremec has long fixed the shifting issue.Luck to you too.