Re: timing gear?
Speaking from recent experience, if you are going to replace your fiber gear with a metal gear, make sure you have/use a steel (not cast iron) crank gear.
After 20K+ miles with a bronze cam gear and cast iron crank gear, all the teeth on my cast iron crank gear broke off at one time and the car stopped running.
Anecdotal evidence shows that perhaps the cast iron may have been the weaker link.
Hope this helps
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