Flat tappet to solid roller...

I want to say comp's rollers don't require a bronze gear, but I may be confused. I know the crane hyd roller I have in a box requires it. I asked a similar question about the bronze gears and there was no real consistent answer. But, of a few answers I received, here and elsewhere, one was to check for timing consistency on a periodic basis and if it started giving any indication of a wander, change the gear...another person told me don't use one longer than 10K miles, regardless of how it looks...yet another said the biggest killer of bronze gears driven on the street was the backlash between the gears and proper positioning of the gear (by properly shaving the bushing) would maximize the mileage.