I have a 1956 312 that has been rebuilt along with the automatic Transmission both original to the car. I've Place them back in the car but when I mount the starter it seems to bind up with the flywheel. The starter seems to stay engaged because when I turn the motor I can hear the starter turning. I've tried two starters that both have been rebuilt and one was the original starter. I'm reluctant to go any further because if the engine started it might tear up the flywheel or worse. Any idea what's going on ?

Thank you

Skyliner