Hey Jasper. How r Ya? I concur on the Clutch setup for that Fellers XLT. A Guy I used to race with ran a setup like that with some Porting, head work and Pipes and he got that Monoblock to radar at 118 mph. in 2,000 ft. on Ice. Only XLT that could take him was an Old Geezer that used to live nearby our Lake that had a Turbo on his XLT Special. Now, that Beast was Wild! I don't think he ever radared it but judging by how bad he beat the natural aspirated 600, I'd wager he could top out over 125 easy with the right gears and secondary setup.
Ciao 4 now.
RACE HARD BUT, HAVE FUN TOO!!