So I'm building my 421 serval this weekend. Curious if anyone could tell me if I should be close with jetting. Dont want to damage a new motor. I have a 421 serval, shearer small bore inframes, 35 pwk, vf4 reeds, +4 timing, 23cc domes running 110 octane. I ride about 60-80 degrees at 1300ft. I was thinking 155 mains with 48 pilots and cel needle middle clip. Any info would be great.