Threw the battery charger on it last night. Checked clearance as best I could between the starter pinion and the ring gear with the gooseneck inspection camera - tough telling without any depth perception, but it appears aligned up.
Last night, when I tried to turn it over, the starter was thumping the drive, but not turning the motor - hold button and it went "bump, bump, bump". Converted Japanese starter, a common aftermarket replacement piece, but the nose of the case has been modified to fit this application, so if it's an issue, I'll need to rebuild it in order to keep the case.
It was at 14.4 volts last night - showing 17.2 this morning. I'll confess the battery connector wasn't overly tight - hoping that's the issue.
I don't want to pull the starter - it requires removing the entire fuel injection and manifold.
Pressing on. I'm double checking the ignition configuration upload so if it turns, I might be able to get it started. I'd like to be able to get the engine started and loosen it up a bit. Still hasn't turned on its own power.