The shape was penned by Giovanni Michelotti. The entry-level P76 featured an enlarged 2663cc 121 bhp (83kW) version of the 6-cylinder engine from the smaller Austin Kimberley and Austin Tasman. The top-of-the-line 192 bhp (143kW) aluminium 4416 cc V8 unit was unique to the P76, and was a derivative of the ex-Buick V8 that was powering the Rover 3500 and Range Rover. Leyland Australia cited a weight advantage approaching for the P76, most of which was attributed to the lighter weight of the aluminium engine block when compared to the cast iron blocks (with bigger displacements) of the V8s from Chrysler, Holden and Ford. It was hoped that the weight advantage would feed through into superior fuel economy and extended tyre life. Nevertheless, the car was a full-size car in Australian terms, for which class leading boot/trunk capacity was claimed.