This was just a test
lol, ok got it.
seriously though, use a massive breaker bar on the bell housing bolts . . you made need a 1" extension for the top ones if you use a short socket and try them from the top . . otherwise you can use a long, long 1/2 inch extension and swivel and the breaker bar and get them from the bottom . . i know these tools are very uncommon for most people to have so maybe you can rent or borrow them.
as far as the exhaust goes . . you can just leave the manifolds on until you get the engine out if you want but you must remove the nuts on the studs on the rear of the manifolds where the pipes are FIRST . . do not unbolt the manifolds from the heads before you do this or you might be very unhappy.
as i mentioned, if the nuts are stuck, get them blazing bright red hot with an oxygen acetylene torch or a propane torch etc . . if you do NOT do this, you will likely break the stud off and you will be totally screwed.
if the bolts that hold the manifolds to the heads are not moving, just use a 12 inch or longer 3/8" breaker bar . . the chance of them breaking is very small but not non existent.
unfortunately, the wd40 will not help for your particular problem.