Made it by the machine shop. Everything turned out pretty well. The adjuster is pretty consistent at being .180 from the rocker. I was able to score a set of 7/16 to 3/8 tapered pushrods on the cheap and it looks like they will work without any grinding to the heads.

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'75 Plymouth Duster
Phase I 451 906/590/2-660 10.75/126
Phase II 451 Stage VI/590/1050 9.82/135
Phase III 383 906/Victor-Pump gas 11.30/119

"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"