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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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