Well get the manual if you do not have it.
Were the coils chopped up or something? Not that I would say to keep them. You can get new coils at partsnmore.com. Are you still using the points plate? If so, stick with the sohc coils. If you were going to use the pamco ignition, which should be listed in the online parts thread, or the dyna S, the cb900 coils are a good choice with some copper wires and ngk plug caps. If you decide to use iridium plugs, they have resistance built in and so non-resistive caps should be used.
Now when you say the guts are missing, do you mean for the housing on the handlebar? If so, you might be better off finding a new one on vintagecb750.com(i think) or ebay, or getting a univeral unit for 7/8th inch bars.
The right control mainly is starter but also your kill switch.
keep us updated in the members build section!
The ride IS the adventure. The destination is just to get gas!