Help! Newly renovated engine got stuck while cranking it...

You should have primed the oilpump untill you had oil on the rockers. It does not take alot of turning over a dry engine to do damage to rings and bearings. How long has engine sat befor it was installed in the car because all the oil has drained off cylinder walls and you are turning it over dry. If it was mine at this point I would preoil and turn over by hand and see if it will loosen up for you. Maybe some guys that do alot of rebuilding will chime in with some other ideas.