Need 4-speed Help

Update:
Pulled the trany and sideplate for a closer look. All the gears and syncros look in good shape and there's different color paint on the gears and shaft that haven't been worn off, so I'm concluding the "Rebuilt" trany may be in good shape.

Before trany was removed, there was a lot of play in the clutch fork adjudtment. With trany removed, there was no play and actually, there was still some pressure on the pressure plate. So, now I'm thinking it was the clutch slipping that was making the squealing noise....

I have a scattersheild w/no inspection cover, so there's no way to check if pressure plate is fully engaging... Can't get a good look through the fork inlet because the header's in the way. Thinking the throw out bearing is binding on the input shaft keeping the pressure plate semi-depressed?

Probably going to reinstall trany with special attention to align input shaft, throw out bearing, and fork. Didn't think this was going to be as complicated as it is, but I guess installing a 120 lb trany using a floor jack by yourself can be tricky...

Any thoughts or helpful hints would be appreciated...