Cam and distributor gear compatibility

mopowers said

If you're using a HV oil pump, consider getting a distributor gear with a hardened shaft like the Melling IS72. It's cheap insurance. O'reilly has them for like $60 last I checked

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I agree on the IS72. I just got one from AutoZone for about $56 I think and last week on the dyno it was driving the HV72 pump in my 340 to 80 psi at 6000 rpm. Hardened hex end, and while the gear isn't pinned, I am confident it isn't going anywhere at my HP and RPM levels. I was going to pin it but the machinist said not to bother.