So I finally got around to swapping motors last week. It wasn't bad at all. It took about 8 hours I'd say. I ended up with a used engine for $700 to put in this. With purchase price being low as beat up as it was it will still be a worthwhile investment.
I did it a little different than recommended. I removed stator and rotor from the motor while it was mounted. Then I was able to lift motor and swing it sideways very carefully and remove it without removing the radiator, shroud, fan, or doors. The piece that holds the doors on goes up and over the flywheel, but with some careful maneuvering it will come out with no damage to anything. New engine went back in the same way.
The worst part was getting the gen head apart. The end cap was rusted on and had to be heated with a torch to get it to release from the stator. I made a puller that threaded into the rotor and couldn't get it to move till I heated the rust around the outside. The rotor would not come off either after all five mounting bolts were off. I ended up threading a slide hammer into the center of the rotor. After several minutes of yanking it finally came free.
Sheet metal is not back together yet, but engine is in and all bolted up with all wiring complete. I want to fire it up before finishing the sheet metal.
Here is the kicker. It has been over a year since I looked at this. The head has been off with tranny fluid in the two rusted cylinders. It still won't budge at all! I tried the flywheel with a large prybar and a long breaker bar on the front. This thing is really stuck! I kept the head but the block is headed to the scrap pile as soon as I pull the few usable pieces off it.