Here's something worth noting:

steel or cast iron crank ... babbit bearings
iron cylinder walls ... aluminum pistons
iron cam ... steel gear
steel intermediate shaft ... bronze bushing

All are dissimilar metals in contact with each other.

Now then ... steel cam ... bronze gear Here's the problem: bronze gear and bronze bushing

The majority of wear will occur on the bottom of the gear. The solution is a thin steel (.030") washer between the gear and the bushing.

Wear from tooth contact should be virtually nil. In the event there is noticeable wear from the cam teeth you have a MAJOR problem for which the only solution is dressing the teeth on the cam. Good luck with that !!!