4.6 Lincoln town car engine completely redone all needed parts changed new radiator, water pump, starter mustang intakes, wiring harness fuse box replaced. Have taken fly wheel from F 150, cause it bolts up correctiy and teeth match up. Clutch seems a little tight. GT has 5 speed manual transmission. Motor turns by hand but bolted up won't turn over. A 35 year veteran mechanic is doing this and we are scratching our heads. Any advice?