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Brad,
I can help you with your first question: bronze or steel.....I had to face the same dilemma with my Mallory/roller cam combo. I've opted for a bronze gear as I could not yet find a steel gear for it. (You don't want to go with iron)
My finding with bronze is that they won't hurt your cam but they wear out at a very rapid rate: I had to change a first one after about 1500 miles and my second one with about the same mileage on it now shows somw sign of being worn out wich is irregularities in fire. The comportement of my engine is much better with a fresh gear....I suppose this have to do with the gear "theething" once worned having some gap with the cam's ....I mean one as to see what's left of a bronze gear after 1500-2000 miles!
Sorry I cannot help you with the specific steel gear that will match your dist. but its worth the effort finding it!
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