I would run the 7747 on it. Get a seperate fan controller from Derale
All sensors need to be hooked up
The other PCM was for a 5.7 with a 4l60E correct?
Not to sure what kind of driveability issue can occur there with no electronic trans.
You could run the 8625 ,it may work fine , but it would constantly light the check engine light and throw codes for trans circuits that arent there, and it may or may not inhibit some performance.
You could have the chip modded to ignore the trans function to run the engine as a stand alone also .
Fact is stranger than Fiction