Why people risk ruining engines to save buying a $25 head gasket and the 20 minute job to remove the head is beyond me but too each his own,,. my advise?

First off QUIT banging it around to get it loose.   The vast majority of the time an engine stuck that hard will also have stuck valves and if you do get it to turn over you will then get to buy push rods, and or rocker arms or if your unlucky a cam shaft and drive gears.  Also if you do get it loose where do you think the rust goes? 10% blows out the exhaust and the rest goes into the oil pan where it promptly turns into grinding compound circulating with the oil, need any more reasons to pull the head?  Never I have been sorry for pulling the head on a stuck engine, and never has a concoction of magic rust busters done anything more then simply dumping diesel fuel in the cylinders,,  I have tested them all.  Others report differently just relating my experiences. Fill the cylinders with diesel and let it soak for whatever time makes you feel good then place  a napkin in each one and light them on fire. Fuel on top of the pistons keeps them relatively cool when heat expands the sleeves and lets some creep down past the rust.  Just after they burn out place a hardwood "punch" on top of the pistons and give it a solid whack with at least a 4 lb hammer remembering that two end cylinders travel in the same direction but opposite direction of the middle two.  Severe cases will require removal of the crankshaft so you can work on one cylinder at a time. That be the case start shopping for a sleeve and piston kit.

Good luck with it

I had a similar situation.  My Dad had this 1951 B for 20+ years, but one year he started having carb problems and parked out of the way in the (humid) basement of the barn, intending to get back to it.  Well, it sat for 4 or 5 years.  It never got rained on, but there was enough moisture to get into and rust 2 cylinders through the valves.

Last October, I brougt it to my house with a stuck engine.  I went ahead and pulled the head (not hard).  I tried every miracle mix of ATF, MMO, Acetome, etc. that is known to man and it didn't get it unstuck.

Then, as kind of a last ditch measure before the liner kit, I got some Evap-O-Rust and filled up the cylinders with the rust (#2 was the worst, but #3 had some too).  In 24 hours, all the rust in the cylinder bore was gone.  I then sucked the stuff out with a turkey baster (it's reusable), and put some light oil in the cylinders, covering the top of the piston and let it sit overnight.  With a pipe wrench on the PTO (no crank) I was able to get the pistons to move a little, maybe 1/4".  No forcing it.  The next day, a little more.  Then the next day, when I applied pressure with the wrench, the engine unstuck.  I rotated the pistone and could see a little rust along the cylinder wall where the piston had been, so I cleaned out the oil and back in went the Evap-O-Rust for 24 hours.  After that, sucked it out, put some light oil back in and just worked the rotated the engine for a few minutes twice a day while I was working on freshening the head and getting the carb right.

After that was done, this:

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Honestly, compression is a little low, but I don't see a need for a liner kit right now, but some day.