How the F do you get to the bell housing bolts?!

Trying to pull the TCI 727 off my 360 LA in a 69 Dart. Cannot get the top 4 bell housing bolts. About $75 in long wrenches and still won’t go. One of the bolts will not take a 9/16” either a 14mm fits better, weird. Any tips or tricks? I have no clue how I’m going to get these back in IF I ever get them out.