727 TC Installed - Probably Wrong...

What I would do is take two long shank bolts and put them in at about 3 and 9 o'clock then remove or loosen all the other bellhouse bolts. Slide the tranny back on the long shankers, and futz to your hearts content,lol. You may have to remove the rear mount and put a jack under the pan and remove the back of the driveshaft.

But just a heads up; you should be able to turn the engine backwards if a bolt is jammed up against one of the oil passage tunnels or whatever else.
But if the starter is jammed into the ring-gear then it all stops.
And if the engine happens to be hydraulicked.......you will have wasted a lot of time and energy.