Ky Grady,
My engines were the same as yours @ 1,200 hours and running perfect. In fact for the 12 years all we ever had to do was maintenance, not one mechanical repair. I did not want to sink 16K into repairing them but I probably could have got another 1,200+ hour out of them.
My first quote for a repower with F250 4.2L with digital controls and gauges installed was around 60K. we got a second quote was for twin F250s 4.2L with mechanical controls, Yamaha began offering this alternative about 18 months ago. That quote was just under 50K installed utilizing existing controls and gauges. Due to the budget we opted for the latter. Many other boaters in my marina have the digital and they swear by them.
The performance on the twin F250s has been outstanding. Top end delivers a little over 50 MPH compared to about 40 with the F225s. The most significant improvement is in the mid-range thrust. These engines rocket the boat onto plane. If I tried to plane my old F225s with one engine it would not get the boat up on a plane. When I tested this one not only did it get up on a plane fast, it powered the boat to 34 MPH. Pretty impressive just in case of a mechanical issue with one engine. The fuel mileage was a slight improvement over the old engines. We clocked 80 hours for the season and we hated to pull it last week. We have insurance parameters that dictated an out of water date. Good luck, any other specific questions give me a shout