De Tomaso were an Italian company founded by the Argentinian Alejandro De Tomaso in 1959 building first racing then road cars.
The Pantera (which is Italian for Panther) was launched in 1970, having been styled by American-born John Taajara of styling house Ghia (which De Tomaso and Ford owned at the time).
The car was a co-development with Ford (hence the Ford V8 that powered it).
Spec wise:
5.7 litre V8
310 bhp @ 5400 rpm
Manual 5 speed ZF gearbox
0-60 6.5secs (European cars)
0-60 7secs (US cars - due to changes made to meet emmisions regs)
Top speed 150mph
Ford cut its losses in 1973 but De Tomaso continued to produce the Pantera in a GTS guise. The V8 was upped to 350 bhp, top speed was up to 175 mph and 0-60 for all markets down to 5.6secs.
The model was sold right up to 1990, with 7260 being built.
The early versions suffered from reliabilty issues, so much so that one owner is rumoured to have shot his car when it would not start. The owner? Elvis.
As a company the are still very much in existance and a good source of info is the website
http://www.detomaso.it/gb/index.html
At the least you will have fun with some of the Italian - English translations.
This site also contains a few Pantera videos.
http://www.sleepy-fish.com/other_veh.htm
Hope this helps