I have done it Bruce, the M is pleasant to walk next to as in Lo range 1st it does notably less than walking pace at idle (V8 torque helps) and if done with a bit of commonsense it makes for an interesting party trick LOL
I also noted after putting the 318 in that when winching the hand throttle is no longer required, if you need to pick the revs up above 500 the load needs a fall block or is too heavy....
Take Care
Slow truck races can be fun. My uncle used to win them fairly regularly with his 1915 Ford Model TT. It had the stock 4-cylinder engine and planetary transmission which fed into a 3-speed "crash box" auxiliary transmission and a Ruxtell 2-speed differential. In low, low, and low, a turtle could outrun it, but it would pull a barn off its foundation!