E extremeattack Active member Nov 27, 2007 119 31 28 Gillette, Wy Mar 31, 2013 #1 Some where to start on jetting 78 with mikuni carb 4700' vintage race at Burgess Junction April 13th. Anybody else tricks of the trade for these? Might be running a 440 intruder to. Which is faster? Oval and drag race.