Mopar Mini starter making noise

Hi Folks, new to the forum and have a question. I just installed a 408 (360 stroker) in my 64 dart 4 speed. When I try to start the car the starter made a real loud noise which cranking the motor. I took off the inspection cover and noticed the starter gear was still engaged to the flywheel. I had to take a screw driver to get it to slid back into place. It was tight , like the flywheel and the starter gear are too tight together. I have not seen anyone else have this issue before. I am stuck so any help would be appreciated, thanks

Specs
360 engine with 10.5 inch flywheel (Mcloud) 734 bell housing
mopar performance mini starter