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Yes, now it's move on to other possible issues

Here's a long shot, but since you are looking around and will have the distributor pulled, pull your oil pressure sending unit, use a piece of coat hanger and poke it in the hole, should stop about 7 3/8 inches down, if it doesn't, here's the plug they forgot. Bad news is; it's pull the pan...

You are limited to something at or less than .480 lift WITH 1.5 ratio rockers, this work out to .320 lift AT THE CAM; with the Magnums 1.6 ratio rockers you get .512 lift at the valve. At about .525 lift at the valve, you have collision issues with retainers and guides, coil bind. Those are...

Now for a little history.......I read about the effects of lead and cylinder wear 30-35 years ago; don't remember the exact source of the information, it may have been an SAE paper, or some other source of automotive information. It was about cars, so I read it. The subject was interesting...

SAE technical papers: #640824, 720689, 710367,860090; maybe these will help

Biggest reason for minimal wear is lack of lead in the gas................