Dead hole. What’s the next step

So a few months ago I got a 318/904 cheap. It had sat for a looong time In A 72 valiant supposedly after the owner had passed. I got it home and fabbed up a run stand. All seemed ok (fluids, had some compression in all holes (didn’t write down numbers but all were over 100), clean under valve covers)so I proceeded to getting it running. This was my textbook. I always used pertronix and sucked at timing and carbs so this was it. I’m going to learn and get good.
I rejoiced when she lit and ran well...I’ve been playing with timing and enrichment etc. got her going real well today but she was “shaky” and I couldn’t get past 14-15 on the vacuum gauge when running.since she was running well and I figured the rings weren’t stuck by now....let’s do a dry and wet compression check before posting here..

mall were 120-130 except for cylinder 2.
60.....I tried multiple times and with oil. Got one outlier of 90 but every other time 50-60.
I pulled the valve cover and checked to make sure the valves weren’t stuck. They were still moving
Pulled rocket shaft and checked the pushrods to make sure they were both straight. They were. No cracks in valve springs seen. Rockers back on. Rechecked compression. 0...nothing. Zero!
Checked 4,6,8. Still fine.

so teachers of mopar...what do I do next/check?
Air in cylinder? And see if goes to pan or?
Valve seat check?