400+ cube guys, what plug you running.
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i ran a tr6 and the autolite equivalent in mine n/a and went 1 range colder spraying a small shot. you will get quite a few different opinions on heat range so take my opinion with a grain of salt lol. i kept the colder plugs in (think they are ngk tr7 ie) and didn't foul so a 7 or equivalent range will probably last if tune is good.
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This is a good link how to read plugs at WOT.
http://www.empirenet.com/pkelley2/sparkplugreading.html