Scott, your setup looks alot like mine. I am using the IH 300 today, on a Kuker 500 gal with Blumhardt booms. My replacement for that setup is in town getting skinny tires and wheels put on. I have 15" row beans, and need to get down those. My "new to me" tractor is a 6085 Agco White. The MFD, cab.a/c and decent seat is a major upgrade for me. Rated at 80 Hp, it handles the 500 gal sprayer just fine.
The upgrade to a 300 from the H was a big improvement. We also have a Fargo sprayer,that we can pull with our Super C, makes a good corn sprayer, if you can get by with 5 gal/acre rate. I am going to make that old Fargo into a boomless pasture and ditch sprayer, probably mounted on the 706, lots of projects, a man must have his dreams.

to be replaced by this tractor