Thought you would be interested in the results obtained with the carb and distributor you recently provided for my M.
In a nutshell I saw a 2 to 3 hp gain on the dyno (to about 60 hp) at 540 pto rpm with a very substantial improvement in the power available at lower rpm as the engine in "pulled down". The "drivability" is excellent with the tractor running (and idling) the best it ever has.
The only glitch came in having had some difficulty in starting until I got the carb adjusted properly--am not used to having carb adjustmentson an M actually producing changes in mixture--no problems now.
Have to say that I am please with the results. W.W., Horton, MI Farmall M