Any of you guys ever use these with E85 and what are your thoughts? I've been using the originally recommended Autolite 103's with my GN1 heads for years. They seem to be working ok, but would like to try a NGK. Compression is 8.5:1, boost is limited to 21 psi due to fueling, timing is 23* and maybe would go up. Car is 90% street, but looking at hitting the track next weekend. The TR6 seems to be pretty popular over the internet, but the recessed tip of the BR6 or 7 EF seems like a good choice for the track. How about the street?