when i have a stuck motor i pull off the heads---then turn it over and pull the oilpan----do whatever you have to do to pull the crank---the pistons that come easy come out first--clean the bad cylinders as much as you can--i sometimes soak with diesel fuel--i have used a steel drift and my largest hammer to drive the pistons out---try not to damage the block more than necessary but remember these old hemis have been bored to 50 over without problems and some can go to 90 over---hey its all fun----bob