Well there are a few issues with getting information on the state of this motor.
It is very hard to work on, I know, because I changed just the water pump through the doghouse a few years ago. Also I am looking at a $150/hr shop rate to diagnose. Then just repairing oil leaks is going to be pricey and I still have and old motor. This thing is so hard to work on that it could get close to what the replacement is going to cost.
My concern is that, I spend all that money then get to replace the engine, anyway. Trust me, I have been involved in mechanical repair, personal,family and friends, most of my life and this this puppy is sick.
The coach is in excellent condition other than the engine. So I might be able to sell it to an RV park to just use as a rental in a permanent location and I doubt that it would be worth much in that scenario. We still want to do some traveling but not constantly. Too many other things to spend time on. A new engine will keep me in the RV game probably as long as I can do it. It really seems to be a reasonable plan. I can't buy another coach for what the engine will cost, especially not one that is in comparable shape coach wise.
Thanks for your everyone's input, has been helpful but lots of other factors involved that have not been discussed here. Just have to weigh the options and make my best guess as to the best course.