tried to turn the 307 over with the starter. 168 tooth flywheel. Staggered bolt starter nose. Rebuilt four field starter. New solenoid and drive. Used flywheel. Flywheel,is on correctly. Hit the key starter tried to edge and hung in the flywheel. Loosen the starter bolts and the drive comes loose. After .160 of shims it still hangs but goes farther into the flywheel. Any ideas as to what's wrong. Engine turns with flywheel tool are at the crank pulley.