Cannon , look up Phoenix castings . I'll bet they make an adapter that I could use. The only problem is the governor , I wouldn't know what to do on that . IThe 4219T is rated @ 90hp but I don't know the torque rating.
You can find many similar ratings for the 4219T online, although they are all for the 4045, a difference of about a liter or 62 ci. A close rating to your 90 hp 4219t is found here:
here.
When this page loads look near the top right corner for an engine specifications search link. Select industrial, engine model, 4045, and english to view all of the 4045's. I would think that the 10th one from the bottom of the list would be real close to what you are looking for.
A variety of SAE housings are available, as well as a low mount exhaust manifold and rear sump pan. You are going to run into issues with the IP, and perhaps some height issues as ag engines are narrow and tall vs automotove applications that are wide and short.
Please ask if you have any more questions about deere engines as I am VERY knowledgable on the subject.