Managed to get mine out with a drift and 2lb hammer today. After 2 hours on the first one that was pretty rusted in I wasn't looking forward to the next but that one only took 20 minutes.
Been soaking them in PB blaster for a week, don't know if that helped.
I have a P90A head and F54 block with crank, no rods or pistons and the cylinder bores are rusty probably need to go up a size on the pistons. In Lake Forest, let me know if you're interested.