Hurst tranny problems

Hurst doesn't make transmisions, they make shifters. Its probably a top loader 4 speed. I'm not sure what would cause it to stick in gear. Since its already messed up, have you tried being rough with it when the engine is off? I had a ol' Firebird (1970)with a Muncie 4 speed that would do it sometimes, the linkage was a little stubourn.

The insidious culprit RUST has likely stuck the shift linkage in place. The shifter should move even if the clutch is not releasing if you can take the pressure off the drivetrain(rock the car a bit). The clutch disc could be frozen to the flywheel. You could try reaching underneath and manually moving the linkage(WHEELS BLOCKED, so it does not roll) to see if that will loosen it. Spray the shifter housing down with a rust penetrant and see what comes out.

Well I finally fired up the engine for the first time in about two years, and even though it didn't sound pretty, I got her going. Anyway, I had the rear end jacked up so the wheels could spin if was in gear, and when I let the clutch out, the back driver wheel wasn't moving. Now I still couldn't seem to move the shifter, so that confuses me. Could the other rear wheel i couldn't see be the only one that was spinning?

Before I started the engine, I also crawled under the car and tried to move the linkage myself, but it wouldn't budge. Wouldn't you think something would have popped loose if it was in gear and clutch was out while running?

It is normal for only one wheel to turn with a standard non-posi rear axle. The linkage is I'm sure the reason it will not shift, you should have been able to move the levers from underneath.
We now know the clutch is not frozen, so it is a shifter problem that you need to fix. Try the Liquid Wrench, PB Blaster, etc. rust buster and see if you can get the rust out of the shifter housing(where the 3 shift rods come together). It is normal for there to be nearly NO lube there, so after sitting that long it is likely stuck. There would be no reason for something to "pop loose" since it is stuck in a gear. If you block one wheel can you turn the other??

On another note, I would change the engine oil, oil filter, fuel filter, air filter and PCV valve before running the engine much. Acids, grime, and varnish tend to stick things!!

Did a Boss 302 ever come stock with a non posi rear? I agree you should be able to free that rusty old shifter.