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Still seems like a governor problem to me ( assuming the answer to Guy's final question is no ). It's sounding more and more like you are probably going to have to take off the timing gear cover and inspect the governor assembly. You said it will hold at least 12K, so that means mechanically...

You know.... I wonder if we could be overlooking the obvious?? Is it possible your governor droop adjustment is way off?? Take an look in the TM, it will tell you how to adjust it. There's a plug in the timing gear cover near the governor. You remove the plug and use an allen wrench to adjust...

If you can't find them from Gary Jones, let me know and I can take them out of a parts motor for you.

I've been in the governors before, but only with the engine removed. Not sure how well you can see or access things unless you at least remove the radiator and housing. After that removing the front cover is simple. I've seen issues with incorrectly assembled internal linkage and other issues...

So are you getting black smoke out of all cylinders? or is it a different color? ( blueish or light gray )

If you have an IR thermometer you can try checking the exhaust temps on each cyl. this can give an indication of a sticky injector. Or you can take the 10mm nuts off the exhaust manifold and lift it up slightly and use a flashlight to see which cylinder is smoking. You can do this with the top...