You'll find that matching numbers really doesn't mean as much as compared to the importance of them for Corvettes for instance. What you are looking for is a rust free car with good mechanicals. Do a search on this BB for further discussions on car purchases. Also, if you haven't already done so, look at the Pantera Owners Club of America (POCA) site for links to sites for owners who have been through "THE SEARCH".
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.