Help stuck engine

Acetone/ATF, blah blah blah.....but nothing works better than a teardown. Nothing. If an engine is stuck from rust, the rings and cylinder walls are damaged. The cylinders need to be honed at a minimum. Don't cheap out on something that is worth well more than the cost of a teardown, cleanup and re-gasket. Although it may end up needing machine work, it may not. But you will never know unless you tear it apart and tearing it apart is a 100% guarantee that you WILL un-freeze the engine. Nothing else is.