Okay guys, here's what I did. As per my first post I went out and got a W9 DC (instead of the stock W7 DC) in order to keep the plug in cylinder #4 from becoming fouled. It is just a little bit wet and it's not like the cylinder isn't producing power or anything. I'll keep you all posted on how this works out.
1967 Jaguar E-type Series I, 2+2