Update on the removal, I got it out last night (this isn't a high priority project). I'm not really sure how I did it, but by turning it a few degrees back and forth while removing it, I found a spot where it popped out, nice as can be.
So now, I'm one step closer to getting it apart. To that end, I have a confession and another question.
First, the confession; the lifters weren't out before the removal attempt, the pushrods were

In that vein, how would I remove them before the camshaft? It doesn't appear that there is any way to remove them prior to cam removal.
The question is; I have at least two pistons that need to come out to clean the bores of rust. I can move the crank (with some effort) and so I'm guessing these pistons aren't going to come out easily. What do I use to get the pistons out of the cylinders?