Just found this thread. I'm up in MN kinda knocking around, could of hooked up yesterday or this morning, you would have been able to see what a '99 looks like after 150k miles.
If possible, try contacting the previous owner for more info on the bike. As a COGger, he/she should be quite cooperative.
Clarification: The 7th gear mod is a different gearset in the bevel drive, it raises all gears up 8 or 12%, depending on your choice. Especially nice if you're doing a lot of slabbing.
Suggestion: Do get your carbies SiSF-ied. Present price is $300, plus any parts that may be needed. This includes cleaning, 2 minute jet mod, and most importantly, overflow tubes.
Finally: Keep and eye on the events section here and over at the COG forum, quite active in the MN area, and nice folks to meet up with. I moved from Hastings, MN to FLA in '06. (I do not miss the winters). Headed back at O dark thirty this Friday.
Oh, and welcome.