'94 Accord Sedan LX 208k

Yesterday while climbing a hill I felt a loss of power and suddenly a
lot of shaking. Prior to this the car had run smoothly, but did smoke
blue smoke at start up. Last night I changed out the plugs. Most had
oil on them so I changed out the valve cover and plug gaskets. The
smoke has since stopped, but cylinder #3 is not firing. The old plug
was black, and the new one was black too after running for a minute. I
know the wires are good, I didn't know better and tested the voltage
with the engine running and I think I burned my multimeter out.

I'm pretty sure compression in #3 is fine because I accidentally
started the car without the plug in and it sounded like a really loud
lawn mower or helicopter.

So now that I have run the car and fixed the gaskets, if I put a brand
new plug in #3 will it work? And will plugs covered in the black
carbon deposit stuff still fire, or are they toast?