Morgan welcome aboard
This question is asked over and over. I think the first thing to do is to establish with ourselves what is our purpose for owning the car;
(1) as a concourse show car or investment
(2) to drive
(3) a restoration project
This helps us to focus on which type of car to look at.
Shoppers who want a Pantera to serve as a concourse show car and/or as an automotive investment will evaluate the car based on how difficult or expensive it shall be to restore the car to showroom condition; this includes the difficulty and expense of reversing any modification or personalization. Some shoppers in this category value a car which retains its “original patina” over a car that has been restored.
Shoppers who want to drive their Pantera are searching for a car that retains its OEM appearance and is in physically good condition. They are also searching for a car that is in good operating condition, that is reliable, that is comfortable, and that performs well enough to be driven with some degree of regularity. Such cars are usually refurbished AND modified with select discretionary improvements. Over-personalization of such cars will diminish their value.
The first two types of shoppers tend to shun cars that have been over-modified, excessively personalized or poorly maintained. Although the 1971 – 1974 Panteras exported to North America were manufactured in relatively high volume, many of them are in a state of being under-maintained or over-modified. This increases the price and desirability of the Panteras which are well-maintained, which are refurbished with a high degree of craftsmanship, which have been improved with discretion, and/or which are in show-room original condition. The values of Panteras which have been under-maintained or over-modified are suffering in this market.
Shoppers who want a project car that they can refurbish themselves must find cars that are priced low enough that after all the refurbishing work is accomplished the money they’ve invested has not exceeded the value of the car (this type of shopper is one who plans to perform the majority of the work themselves because it would otherwise be impossible for them to achieve that financial goal).
You should find many topics (threads) on this subject right here. Sticky #2 of this forum for instance. When it comes time for some personal assistance, I would imagine the folks at Svenska De Tomaso Klubben shall be eager to help you.
http://www.detomaso.nu/