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You can't know until you check. A new OEM head with valves is still available and a lot cheaper than a new motor. If you just need a new valve, I got some clean spares. Pushrods and tappets are readily available.

https://www.steelsoldiers.com/upload/M35/TM9-2910-226-34.pdf Pages 1-18 and1-21 have the drawings for the governor. I suspect that the engine can overspeed if the fuel control rod is incorrectly installed and won't move. As for the dead hole: Not saying you ought to do it that way, but I put on...

Do yourself a favour and make the temporary fix your permanent fix. Remove the complete flame heater setup and plug the connections. Unless you regularly fire her up in well below freezing you don't need it and if you do need regular cold start help, spring for a KAT 24V ether dispenser that...

Let us know how it turns out! Hopefully that will be the extent of your problem.

"Runaway" is not the same as "wide open throttle" (WOT). In the former, the engine typically feeds on fuel OTHER than the fuel supplied by the injection pump, such as engine oil leaking past turbo seals etc. Because of the alternate supply of "fuel", the engine rpms are no longer governed or...