For a show/play tractor a 3-71 would be fine. But for a "working" M, a 3-71 repower has a high risk of tearing up the transmission/rear end. (Keep in mind he M rear end is designed for about 40 HP - a 3-71 easily delivers 120 HP.)
Not certain however whether there's sufficient frame length to shoehorn in a 3-71 (it probably can but it will be tight). The shorter 3-53 would be the better choice if you really want a 3 cylinder, Detroit-powered M.
Regarding pullers running small block V8's, these develop their power by running much higher RPM's. The torque delivered to the rear end may actually be not a whole lot more that of a stock engine. Further, a puller tractor transmission only to needs handle this for a few seconds during a pull.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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