Tony,
If you can identify which MSD ignition module is installed in your car, you can go to the MSD web site and find a PDF file for the instructions for that module. The instructions will include a list of MSD coils recommended for that module.
-G
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.