There used to be plenty of Ford Model A/B performance parts out there, and the Ford flathed tractor engines are very similar to those.
You can mill the head - a machine shop could tell you how much.
More displacement always helps, and more RPM's would help. A flathead is limited on intake and exhaust flow, so clean up the ports and relieve the valve pockets. I don't know if there are bigger valves that would work but that would help.
You'd need more carburetor long before you'd need more exhaust system, so 30% more power from a dual exhaust is not likely to work out. Look for a dual carburetor setup or a bigger carburetor. Buy or build some headers.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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