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Do you mean '65?

Are you sure you have a '72? Looks like a '71 to me.

First you need to know how much mechanical your distributor provides at full advance and go from there. If you want more initial you can always limit the top end with an FBO limiter plate.

I would imagine the end of the rod that rides on the cam eccentric will be exposed to considerably more wear than the pump arm end. Wouldn't see why you couldn't use the oem steel version. Comp has the replacement with heat treated tips for around $30.

I got 112k out of my original and it quit. Put in a near perfect full length used original. That should last til i'm a pile of dust in the ground.

The hardened steel rod is for stock type iron cams. Is that what you have or a roller cam?

Agreed. First thing I'd do is pull the rod out and see how close to 3.22" it is and go from there. Been there with that same symptom and that's exactly what the problem was.