This has got to be it
What is particularly noteworthy about the Custom Sport Special package was the available 426 Wedge engine. Accompanied by a special set of custom gauges and tachometer, the CSS package was most likely the first muscle truck there ever was. This possibility makes the 426 powered CSS one of the most collectible and sought after Dodge Trucks around. Even the CSS package without the big powerplant is prized, mostly because the interior differences are also a rare find.