The installed valve stem height is the same no matter which head is used on the M. If the valves are too long your replacement head is either for distillate or kerosene. Gasoline head valves are the longest.
The machine shop should have know the installed valve spring height was wrong. They would have needed a lot of spring shims to get the height correct, enough to know that there was a problem with the valve length. even if they were such a thing as longer push rods you would need to raise the rocker shaft enough to compensate for the increase valve height and without a lot of spring shims the spring pressure will be way too weak. Then you would need to lengthen the oil supply tube to feed the rocker shaft. When you got that done the rockers would most likely hit the vapor vent tube and may even make contact with the valve cover.
The only real solution is to redo the job and make sure the valves are correct for the head being used.
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Today's Featured Article - Memories of a Farmall C - by Monty Bradley. When I was a child, my grandparents lived on a farm owned by a Mr. Walters. The crops raised were cotton and soybeans, with about forty head of mixed breed cattle. Mr. Walters owned two tractors then. A Farmall 300 on gasoline and a Farmall C, that had once belonged to his father-in-law, and had been converted from gasoline to LP Gas. Many times, as a small boy, I would cross the fence behind the house my grandparents lived in and walk down the turn row to where granddaddy would be cultivati
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