300 to a 330 is much diff...other than the actually rim dia ( 330 is 17 and 300 is 18 rim). I roll on a 330 and love it....YES I lean her down good in the turnes. YOu have to spend time and learn it,, but then your golden.
330 OSD drive..NO jackshaft is the way to go for longevity. NO dual chains to constant adjust and NO jackshaft bearing to keep blowing out. I jsut converted my 330 Jackshafter C&S arm over to a OSD yesturday. WOW...what a diff in free rolling the tire.....LOTS less drag on the chain. Have not rode it yet, still small things to adjust, but will get out today on it.
Write up of the conversion coming soon.
330 OSD kit would be my #1 suggestion to any one thinking a fattty.