First off, lets go through some stuff.
You can find and download the K series service manual here:
http://www.onlycubcadets.net/forum/s...ead.php?t=4646
You can find my article on static timing here:
http://www.onlycubcadets.net/forum/s...ad.php?t=33461
How to measure a plow:
plowmeasurement01-1.jpg
Here is a video of me plowing with a 10hp tractor:
https://www.youtube.com/watch?v=KjoprqwTkrI
As a note, I have since went to narrower tires on that tractor. That is a gear drive 10hp Cub pulling an 8" plow. You can pull a larger one though. Just what I have. That was the only video I had uploaded on YouTube and easy to link without uploading others. You don't need anything bigger than a 12HP to plow with.
On the motor, read this article:
http://www.kirkengines.com/downloads...ohlerPartI.pdf
Then Part II:
http://www.kirkengines.com/downloads...hlerPartII.pdf
That will keep you busy for a while. I'll be back later this evening with more info on building...... just read. Don't plan yet.