hello all. question about plugs. recently made a 900 mile round trip to Kentucky for the Bourbon Blitzkrieg Run and Beatersville. on the way back car was running pretty sick. pulled plugs and 1,2,7,8 plugs only have .004" gap. before the trip I took checked them at .025". this is a 263 in a 52. converted to 12V with pertronix. running autolite 86. I don't think the pistons are kissing them.....no witness marks. could timing or A/F ratio cause this? what is a good plug to run and at what gap for 12v? been running this set up for about 2 years and put over 7000 miles.