My engine is out of the vehicle, and spins freely when the transmission is not attached. I attach the tranny all the way in, then tighten the bolts from trsnny to engine securely, so everything lines up. After that I can't rotate the crank by hand.
- my tranny input shaft spins by hand when I twist it.

Is the flywheel suppose to spin freely , with the clutch and pressure plate on? I can't spin it by hand or with a screw driver or anything.

 

I've never tried this but taking a random stab at your situation. Actuate the clutch lever. Maybe the disc is clamped off center at the moment.

 

So your engine will turn when the clutch and flywheel are off, but when the clutch and flywheel are installed, you can't crank the engine anymore? Kind of confused on what you're saying.
(not talking about transmission yet)

 

I got it to turn, I think the first time I put it in... It must have not pushed all the way through or something; think I forced it at a weird angle, but nothing looks damaged. The second time I installed the transmission I used my hoist to ease it in.