1970 Ford Bronco starter issues

I'm replacing my OEM starter in my 1970 Ford Bronco. It's a 3 speed (on the tree) manual transmission with a 302 V8 low compression enginge. I purchased a Powermaster XS Torque model 9504 but it doesn't seem to be fitting flush. Any ideas or recommendations? I believe it's 164 teeth on the flywheel but not certain, either. Any advice?