Your NOT going to have ANY problems with going GEAR DRIVE ,,,,
IF done Right.(.)
On any year and model, the Crank Run Out is the VERY important thing to have checked BEFORE you order any parts.(.)
If the Crank run out is more than Total .003/.004 I would NOT go gear drive.(.)
*****Just note that I have had VERY good luck using gear drive SS cams.
The older (before the newer 96") engines seemed to have Less Problem with Crank run-out.
The Least $$$$ way for you right Now is to go JUST with the change of cams/adj. push-rods and be done with it... You have all the "good things" in your Newer style bike and really don't Need Gear Drives UNLESS You want them..
The call ofcorse is all yours but why go thru the $$$$ just for the gear drive system when you Don't need to..
On the older engines, (pre 06/07) the motors needed a lot of updates/upgrades..
Like, tension SHOES, oil pump gerotors (larger on pressure and return flow)
This is ALL there on your newer style motor...
Just MY opinion.....
signed....BUBBIE