Don was barely computer literate, and not used to using a keyboard, His mind and hands worked much more quickly than he was able to type out. (If you ever met Don, you know how quickly he worked. Even in the final stages of his illness, he probably had more energy than I do. Or at least acted that way.)
I'm thinking that the motor he was replacing was the fan motor. I remember him having some issues with those.
The last engine he put in it was the 3.4. And that was WAY before this.