You are trying to do this the hard way. Leaving the transmission and bell housing in place will make reinstalling the new engine even more difficult than removing the old one.
When the front clip (fenders, grill, radiator, etc) is left in place, it is easier to remove the transmission, clutch assembly, and flywheel first. Then you can get to the 2 sneaky bell housing bolts and remove it.
If the front clip is not in place, it is possible to remove the engine and transmission as one unit.
Carl
