I have a steel hydraulic roller cam in my 74 Euro Pantera along with a melonized gear that came with my Progression Ignitions distributor. The gear has been working correctly for several years.
In my GTS project, it has a steel hydraulic roller cam (Comp Cams) and a Holley Dual Synch distributor that came with a steel gear. It has been running for several months this way.
I think the bronze gear would only be an issue if you drive the car a lot.