Reply to "I'm stumped ... I'm fouling the #2 spark plug"

Nah. It's not the valve. Don't worry about them.
They just suddenly come apart and the internal noise of the valve crashing into the piston and being compressed into the cylinder head is unmistakeable.

There won't be any doubt when it happens.

High probabilaty of one of two things. #2 has a vacuum leak unique to itself or The plugs are fouling and showing mostly on #2, or both.

Are you sure that you have the right plugs?

The stock iron head should take an AF-32. On a low compression C you should also be able to run an AF-42 which is hotter.

I have found that as of recent the cross over substitution charts are wrong.

What has happened is the following. The Motorcraft BF-32, which is the 18mm plug has been discontinued.
Motorcraft has substituted the BF-42.

Companies like AC have crossed that over as the 45. The 45 is the BF-42 not the BF-32.

Now the computer geeks that just know data, came to the conclusion that the 32 is a 42 and heck we can do that with an AF too right?

You have to see what some of these jerks have done! Someone crossed over the F11y, F9y, and the F7y as all being the same, depending on whos charts you look at.

The 17 year old NAPA kid who thinks he's an expert on everything, is likely to give you whateva' jabonga plug he can get and tell you you're an a-h if you don't agree.

Bottom line, run a Motorcraft AF-32. That's the correct plug for the car.

If they wanna' argue, like the quote says, just tell them "if I had the time, I'd join a club, and then beat you with it".
If he keeps it up, just tell him that you heard that his girl friend is late. See what a smart ass he is then.