I was reading your old post on Oliver 3-pt plows. Well I just picked up a 3-pt 3-bottom 14" plow. It is on my 1650 and I have worked lined up for it now. 
Have you found any information on the plows? I would like to come across a manual for my plow but I need to find out just what it is. It may be a 3241 like I've seen. 
Good luck on your search.