mechanicalmoron

That's very low. To be clear, you should check compression as follows:

Make sure your battery is charged, and use any other starting assist device you can.
Remove all plugs (unplug coil, if you love it)
Install tester firmly/tightly onto cylinder to be tested
Crank and count ten compression strokes
make sure gage isn't dropping pressure (loose valve core in compression tester check valve), and record reading, repeat on remaining 3 cylinders.

If that looks like what you did, try it again, with a cap full of motor oil down each cylinder. If it jumps up dramatically, it's probably rings/rebuild time. But either way, it's probably that time.

That said, this is what these motors do. If you want to drive it, it's probably not about to disintegrate by any degree, you could drive it plenty while getting together another motor or overhaul plans/research for this one. Your rings are burnt up and will let lots of blowby, you'll have a smoky pos and will have to add lots of oil, but if you want to drive it go put a full change of 20w-50 with a quart of lucas, check it often, and keep pourin' it in... thickest cheapest stuff you can find, 20w-50 is in spec for a new KA (over like 55f or something), so considerably thickened from that won't do much harm in your motor, with it's excessive clearances. Obviously you will have to further isolate the miss to spark or fuel on cyl 1, and fix that.

Also, it'll leak really badly, because the blowby will overpower your old clogged pcv and push oil past all the seals when the crankcase pressurizes.