Late in 1971, Ford began importing Panteras for the American market to be sold through its Lincoln Mercury dealers. The first 75 cars were simply European imports and are known for their “push-button” door handles and hand-built Carrozzeria Vignale bodies. A total of 1,007 Panteras reached the United States that first year. Early crash testing at UCLA showed that safety cage engineering was not very well understood in the 1970s. Rust-proofing was minimal on these early cars, and the quality of fit and finish was poor, with large amounts of body solder being used to cover body panel flaws. Notably, Elvis Presley once fired a gun at his Pantera after it would not start. Several modifications were made for the 1972 model year Panteras. A new 4 Bolt Main Cleveland Engine, also 351 cu in, was used with lower compression ratio (from 11:1 to 8.6:1, chiefly to meet US emissions standards and run on lower octane standard fuel) but with more aggressive camshaft timing (in an effort to reclaim some of the power lost through the reduction in compression). Many other engine changes were made, including the use of a factory exhaust header.

Read more about Panteras here: http://en.wikipedia.org/wiki/De_Tomaso_Pantera