i use chris marshalls iggy. it replaces the points with a magnetic pickup and is mounted on a plate he makes. it has a fixed advance. bolt it on, lock it into place. its actually a dyna s from a cb500/550 etc thats modified to run on the 350. there is no black box. it is crank mounted, replaces the flywheel, so you will have no charging system left. pretty much race only. you can contact him on through his webpage.
jc
jc