The 1958 model year and the four that followed all had the exposed four-headlamp treatment and prominent grills, but a faux-louvered hood and chrome trunk spears were unique to 1958. The interior and instruments were updated, including placing a tachometer directly in front of the driver. For the 1958 model, an 8000 rpm tachometer was used with the 270 hp and 290 hp engines, rather than the 6000 rpm units used in the lower horespower engines. Optional engine choices included two with twin carburetors (including a 270 hp model with Carter 2613S and 2614S WCFB four-barrels) and two with fuel injection. Power output for the highest rated fuel-injected engine was 290 hp. Displacement remained 283 cid. For the first time, seat belts were factory-installed rather than being dealer-installed as on previous models.