Update/reply:

I did replace all four plugs when I got the car, they were Autolite crap and I replaced with fresh platinum NGK plugs. Compression came back, all four cylinders were very close (1-3psi). The fuel filter is a strainer within the fuel pump assembly, so I'd have to pull and replace the pump (not a big deal).

BUT I definitely have a failed head gasket. Some white residue appeared under the oil cap last week after a few miles of driving. Just yesterday all of my parts came in.

I will now be replacing:

Head gasket
Camshaft seals
Ignition coil
Spark plug wires
A couple of vacuum hoses (they're old)
Downstream O2 (just need to borrow a buddy's blowtorch)
Replacing the valve cover gasket since it's already been seated and driven

My OBD2 scanner is very basic and just displays codes. I think my local Harbor Freight has a detailed scanner on clearance, will look into further.

Will post an update when I have one.