 The concept was for a power packing 302 4v in a plain wrapper coupe, in rare cases they were fitted with Shelby manifolds and 4118 Holley carburetors.In late April, at least 7 units came with the obsolete 289 4v while in early to mid May 1968 they included 21 units out of 154 that were all J-code 302 4v's with specially geared 3 speeds in a "lightened" chassis (no power options, aluminum intake, no a/c).The power-to-weight ratio in the Challenger gave the budget-minded buyer a chance to run with the Shelby Models without the cost.