Bare Bones Budget 400 Build

Well, I tore one of my "new" slants down to the short block. One piston had the rings rusted up. So I knocked it out and it's been in Evaporust for two solid days. Still rusted solid. So tonight, I dumped some vinegar in a big bowl and stuck the piston in it. We'll see what it looks like tomorrow.
Got the rings free yet? We got 6 to do. Wondering the best way?