Having stuffed G21/.35s many times in combat competition, disassembly of this engine is something I've encountered.
The battery terminal puller works well for the drive washer, as others point out.
The stock rear crank bearing is weak. A replacement 3L01 bearing, or a 773L01, such as a "New Departure," is better.
To remove the rear bearing, first remove the crank. Then heat the case in an oven to 225 and tap the rear of the case onto a block of wood. The bearing then falls out.
Though it is true you can use a torch for a variety of purposes, the even heat of an oven is less likely to damage the engine.
Good luck with your classic engine,
Peter