If it's any consolation, I have an H that's doing the same thing. Just doesn't run as smooth as it should.
I've done just about everything you have, except pull the head, either replacing parts or borrowing parts from another H that does run like it should. I did check the valve lash.
A buddy of mine suggested a vacuum leak about the same time I thought of it. I've ordered new manifold gaskets from YT, so that's my next step. I may go ahead and pull the manifold this afternoon to see what I can see.
The odd thing is, it sat outside for several months over winter, and when I went to move it a week or so ago it started right up and ran fine for several minutes before it went back to its old ways. Could dirt have temporarily plugged a manifold gasket leak?
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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