A few suggestions:

If I remember, right head bolts are the same thread as the tranny bolts. Go to your local P-N-P and rob some off an engine. Cut the heads off and slot them to use as alignment studs.

Are us using a tranny jack? If not get at least one friend to help you.

I take the T-case (s) off, makes it a lot easier.

Once you have it stabbed into the clutch disc but not the pilot bearing, do not let it hang there, it can distort the center of the disc and screw it up.

Once you get it almost in but it will no go that last little bit try pulling it in with the bolts very slowly, half a turn on the bolts with a wrench while wiggling the back of the tranny. Be careful here, I had a friend break an ear off his tranny in a 56 Chevy, and that was a cast iron case.