Cylinder has spark but not firing..

So ive had this 360 torn apart 3 times now and im going to scream since ill most likely be doing it again. Heres whats going on...

I have a brand new set of J heads on the motor. I had them put new hardened valve seats in, valve grind, and surfacing all sides of the heads. For some reason, nothing happens when i pull #2 and #8 plug wires out. They're giving spark but im not getting any action into the cylinder. Ive tried multiple sets of spark plugs and they all do the same thing.

The bottom end is stock. Original rings and bearings. I haven't gotten around to doing a compression test on it, but im thinking i have bad piston rings. If i have spark, and i know my cylinder heads are good, i can rule those out. The only other thing i can think of is low compression caused by bad piston rings. What does everyone think? angry9: