www.techcycle.com makes a great kit for your bike. Also, BDL makes a kit that looks to be nice. Havent installed one yet, but have a bike comign in over the winter for one.
Open belt drives are typically very reliable provided they are installed correctly and kept clean. Just keep in mind though, the kits take away the compensator assembly so the ride might be a bit "rougher" but thats your call.
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Hillside Cycle custom head work
S/E 4.375 forged crank Darkhorsed
Axtell 117 cyls and pistons
Mikuni HSR48
S+S Super D manifold
Black Boarzilla
Wood's TW9BG cams and KF325 filter