Just replaced engine with a junk yard one. Hooked everything back and up added fluids . It still won’t start. When turning the key I would just get a loud click. Checked battery and believe it was the starter. I then replaced starter, which then started on fire.

Noticed that I can no longer turn by hand or braker bar. I could at the junk yard, but can’t any longer. Removed spark plugs to see if it was a compression issue with no success.

Any my thoughts on what to do next?