I'll probably have to put those magnum heads on the 318 mag I have and race with that. I have no performance cam, though, and the funds are really low for this project.
I think a main starving for oil because the bearing spun.
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I can grind you a cam with my bench grinder. I can Precision grind to within 1/4 inch. But I'll put extra care into the cam for you and get it to within an eighth of an inch.
Too bad it did not piggyback a rod bearing then you would have more compression if it was on the top side.
Of course then you have to worry about the Piston hitting the cylinder head.
I have a 3.9 that I can give you that is still good
Then I will fix the transmission in my Jeep Grand Cherokee and we can race 6 cylinders. Sounds like a lot of fun to me. Don't lose hope. LOL