another correction ... i actually came in behind both ana and brandon. ana rode a stock carabela (minarelli engine, 14.14 carburetor).
brandon had a performance exhaust .. can't remember the kind (i think it was malossi?).
my exhaust was a polini (not leovinci). also, dan's bike was stock but w/ a 14.14 carb and a 59 jet. my bianchi had a 15.15 carb and a 55 jet. also, i had a 12-tooth front sprocket. oh, and the special racing airbox (so does dan) on the dellorto carb.
also ... i think simon's bike had a performance exhaust (leovinci?), not stock.
and, yes, minarelli is the way to go.