Unless you have a yard full of old IH product littering your property, you are talking about cubic dollars. There is no point in upgrading a M to SMTA capability because you will, in effect, destroy a SMTA by putting an old M motor in it. On top of that what are you going to do about hydraulics? Just get on with your life and own a stock SMTA, 400, 450, 560.
OK, having said that, let's get to the meat of your situation. You want a go-slow tractor. I like them too. I have a SMTA with a 560 differential, some 560 bearings, and 560 tranny gears (1st gear in particular). The TA works. The tires are 15.5 x 38. This set up gives me about 11-12 mph in top gear/high range. The rated speed of a SMTA is 16 mph. Low gear/low range on my tractor is at least 50% of low gear/low range of a SMTA. There is not much more that I can do without bolting up 660 planetary axles and wheels. That would really be "creepy". Top speed would be around 8 mph. Everything can be calculated with the parts books and knowledge of the loaded radius of the drive tires.
I don't think you need to go to this trouble. A TA equipped tractor starting with a 300 (skip 330 and 340) and going thru to 660 will run a rototiller. The 300 will run a five footer, The bigger tractors will probably run a eight footer. Bear is mind that there is a big difference between sod and previously tilled soil. Soil types make a difference too.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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