I installed a 360 in my ‘79 CJ7 manual 4 speed and it will not turn over with a new starter. The starter bench tested fine Installed and sounds like it is stuck just a loud hum and the engine won’t turn over . I can turn the engine over with a 3 foot breaker bar and it will turn over with some effort.Engine was bought used. Need help with deciding if my new starter is binding or if is the engine. Any advice will help. Have owned several jeeps and did engine swaps with no problems.