You don't need to free up the engine to remove the clutch and pressure plate. Just use a small hole saw (3/4") and a flex socket to make holes in the bell housing over the pressure plate bolts you can't reach. It doesn't hurt the bell housing at all- - - -it just adds a little cooling air to the clutch. Once the clutch and flywheel comes off, you can either unbolt the rod and main bearings and lift the crank out, or just use a big hole saw, like about a 3" diameter in a variable speed 1/2" drill motor or a floor mount drill press to cut the piston tops away just a little inboard of the piston rings. An engine that's stuck that bad is going to need to be rebored, so there's no sense in trying to save the pistons. Use standard bore 235 aluminum pistons during the rebuild and bore the 216 .060" oversize to get 224 cubic inches.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!