Correct Direction

Cudabnu said

I do have a set of dougs headers and Pypes dual 2.5" exhaust on my other 318 64 Valiant I can swipe when the time comes.

Is there an issue with the oiling for the heads and using head studs?

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No, the issue is that only the early Magnum blocks are still drilled for head oiling, a holdover from the LAs. Later blocks omitted the passages entirely, as Magnums oil through the lifters & pushrods. Confirm that the passages are there in your Magnum block and you'll be okay. The LA roller block is fine as-is. I'll see if I can find a pic.
And by the way, since you're swapping from a slant to an eight, don't forget to hunt down an early A V8 centerlink. And the V8 throttle pedal and linkage. And for both of the blocks I mentioned, the 360 (NOT 273/318/340) pass. car oil pan & pickup.