Bronze will work with either cast or steel cams but it's not usually the best choice. The bronze gears tend to wear out quickly. You could definately use it for now and replace the gear for a steel one when you get some free time.
'75 Bronco- 351w, c4 35" MTR's, linked etc.
'11 f150 EB- tow rig for the Bronco.
I wheel my junk!
I ran a cast geared distributor for a few minutes in a 331 on an engine stand, it maybe had 5 minutes run time, and it had noticeable wear. This was a fresh reman distributor. Before swapping gears, you might want to just buy the correct distributor instead. New reman distributors run about $55 from Advance Auto Parts, the steel Ford Racing gear is only $10 or so less.
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