Hmmm, you fabbed up your own turbo kit but don't know how to gap your plugs? Sounds like this is going to be an interesting kit. I'd definitely like to see pics.
Oh, and you DON'T want to increase your gap on the plugs because that will promote spark plug blowout. The air is denser so for the same strength spark you will want to shorten your gap and run a plug one two ranges colder depending on how much boost you are running.