Get the trans as close as possible without forcing anything, and install the bolts just snug, don't try to force things into place. Then depress the clutch pedal. If there's a slight misalignment, releasing the pressure plate will allow everything to fall into alignment. If you give the trans a little shake and push from behind while the clutch is released, it should fall right in. If not, remove the clutch and pressure plate, and see if the trans will bolt up without the clutch installed.
One mistake that happens occasionally is the clutch disc gets installed backwards. The hub with the torsion springs in it needs to face away from the flywheel. Yes, it can be installed either way, but it only fits right one direction.
Jerry
