I'm getting ready to finish wiring and firing our 292 in the '64 F100 that we're working on, but my start clicks, bumps out engages the flywheel, but doesn't seem strong enough to turn it over.  It's a brand new battery, and the engine turns over easily by hand with a socket and ratchet.   I'd like to use a newer, mini start if possible.   Any suggestions from folks that have upgraded in the past?  What else could be my problem besides the starter itself not being strong enough to turn it over?
Thanks!!

1964 Ford F100 w/ 292 Y-block
-Central Florida-