Would these be the rings? :P

Good thing they're fragile as hell...
Finally got the pistons free, Took a lot of chemicals and some manual labor.

Cylinder #2 didn't look damaged badly. Theres some pitting near the piston BDC position, but it isn't that deep. However, the cylinder #3...

Pitting looks really deep, and it's all over the swept area. I just hope boring will cure it.
Finally, a photo of the block with the R2 crank on, just to keep spirits high!

Perfect fit! The counterweights didn't touch the pan, so that's definitely a nice turn.