Partial update. Got it apart and changed the flywheel key. No *apparent" damage but changed it anyway. Considering 2 of the motor mounting bolts were bent, it took a hit when it rolled.
It turns over much easier now...just gotta get the carb float/orifice/spring back in the bowl right. After a couple of hours on my knees on a concrete floor it's looking like I'll have to take it off the frame again to get to it.
I've had enough fun for one day, though and a neighbor is trying to ambush Bambi out back so it's an excuse to quit for the day. Thanks for all the info!