Hi David,
My feeling is that you would be most unlikely to get reliable if any information other mine via this site. My advice would be to use this link:
http://www.fordsontractorpages.nl/
and click on their forum link to get in touch with people who would have the specialist engine data you need.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix tractors.