OK, an update and final closure on this issue from me. Went to NAPA today and gave them John's spec's for the relay. Few minutes in the books and counter guy has part number and they have it in stock. $13 later, I am out the door. When I get the relay home I thinking I've seen this before. Went digging through my electrical parts and sure enough, I already had one. Spare horn relay. Guess I have a backup for my start wire up now too.
Hooked it up per John's diagram and it was golden. Starter button cranks motor in park and neutral only. Didn't need the jumper wire at the starter solenoid since my battery cable goes direct to the starter. Small wire on MOPAR starter goes back to output side of Ford relay (solenoid) on the firewall.
Just want to say thanks to everyone, esp. John for the help.
Here's a pic of the wired engine....
On edit: The NAPA part number was AR272 in case anyone needs to do this in future.
