Over the last year i've experimented with a lot of different spark plugs in the pursuit of eliminating KR and pre-ignition. This week I found that a hole in the corrugated fuel line was the culprit. However, I know have to choose between all the different plugs I have laying around. AL 104's, AL 103's (Race Version), TR6's, TR6 IX's. I'm currently running about 14lbs of boost on a 2.8 pulley with e85. Stock cam, but have 1.85 roller rockers. Which is best for my set up?