Stop in for a cup of coffee

Well ****. Was out trying to fire up that poly in the 64 polara this morning. All new fluids. Started to turn over and then locked up tight. I can't even budge it in either direction with my 3/4 drive, 6 ft breaker bar. :BangHead::BangHead::BangHead::BangHead::BangHead:
Before I'd started , I'd borescoped each cylinder, looked just fine, soaked the rings with a couple squirts of ATF each for a couple weeks, then rotated it over by hand a few turns, drained all the fluids. Then tried the other week to fire it to no avail, realized I had the wires backwards, so I switched them this morning, locked up in less than 5 seconds.

Good news is that I have options, another 318 poly or the 440 swap...