Spark Plug Fouling

[Coupe]

Cylinder no. 1 has a repeated fouling issue.  It's only happening on no. 1. No smoke just miss from a fouled plug.  I am assuming it's a bad valve seal.  I've been told a temp fix is to install a spark plug non-fouler on that cylinder.  The issue is no. 1 is behind the generator.  Adding the fouler extends the plug about 5/8" and there is no room for the for the plug boot, even an angled boot.
I've been using AC R45S plugs since the overhaul 20 years ago.  I bought the shortest non fowler NAPA  had.  Any suggestions on a plug that is shorter. 
Thank you in advance for any help.
Paul 

[Poncholover]

Perhaps a hotter lug.

[fishnjim]

Didn't say what car, but assuming it's a '57 w/A/C and the generator is one the driver side?   365 #1.
I don't see a plug being the answer.   As you say, not much chance.   Fix the issue that's causing it.   
Did U run a compression test on that cylinder?   
No smoke but is the exhaust pipe black inside?
Is it just carbon soot fouling(black), so plug grounds out and doesn't spark?   Or some other fouling, oil, etc.
Check the electrical path from distributor cam on to the plug as well.   Could be something simple, a bad cap or wire or connector not completely engaged.   Could be a more serious wiped cam, head gasket, valve train, etc.   

[Coupe]

It's the '57.  I'm going to forget the bandaid and find the cause.  There is only 24,000 miles on the engine since a total over haul.