How to free up my 440

I've had a car drag the rear tires trying to free up a stuck engine. The only thing that was stuck was the oil pump drive to the bushing and the bushing to the block. The last 383 I had turned over fine... but had 8 stuck valves and associated bent pushrods from turning it. Others were the piston pins to pistons, locking them in place. I have not had many that were stuck by rings or with parts that were reached by adding anything to the cylinders. Just my experience anyway.
If yours was in damp, pull the exhaust manifolds and look in the ports. If any have the valve open, that's probably going to have the stuck parts. I'd pull the covers. If it's full of rust, pull it apart. No need to waste effort.