Fumblin,
1946 isn't my forte, but we will assume the transmission can be put into neutral so a frozen drive train can be eliminated. I don't think the bottom would freeze up just because of the oil rich environment. That leaves the cylinder walls which through condensation could have become "fuzzy". I would do just as you have done..dump some good oil down the plug holes, let it sit awhile and turn it over.
Does the '46 have a hole through the front for a crank handle or am I lost in the fog. If you can't access the front somehow, you could always do the "crawl" to the flywheel area, and using a long bar against the ring gear and bellhousing give it a pry.
Pulling the rig with another vehicle and dumping the clutch in gear would be plan B..or it could be plan A.
If the engine is seized or damaged from a hard freeze, it will probably NOT turn over. If it is just stuck, it will turn over with at least one of the above plans.. If you are really trying to save the engine, I would not just "unstick" it. I would do a systematic teardown starting with the head...the brute force methods will get it turning, but might ruin/score/bend stuff in the process.
Before doing anything, I would pull the starter and remove the fan belt...the accessories could be what are holding things from turning! Good Luck!
Stuart.
