I installed a Mallory Unilite last year without incident. See this link for details:
http://www.banzairunnerpantera.com/updates_distrinstall.htm
Make sure you have a ballast resistor. I'll dig around the garage this afternoon to see if I can find the wiring diagram Dennis Quella provided with the distributor.
Cheers!
Garth
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.