I have heard it does. I would think you could drill a hole in the piston near the bore and die grind or saws all toward the bore. If you relieve the pressure you should be able to pound them out. Getting the crank out would be the trick. I got a 273-2 from the same guy and I was able to get the crank out with all the pistons stuck.
i tried it once with a 318. i just let it soak for a few days, rotated the thing upside down, let the coke drain out, then hit it with a breaker bar on the crank bolt and it broke free