Further restyling for 1963's 300J (the letter "I" was skipped) left the car with a smoother, more angular 1960s look. The convertible was dropped, leaving the coupe; the "short ram" racing engine was also discontinued. The only engine available was the 413 in³ (6.8 L) "long ram", with an increase of 10 bhp (7.5 kW) from 1962. A redesigned and more sumptuous interior featured an oddly squared steering wheel. The 300J was faster than the standard 300H of the year before, with a 142 mph (229 km/h) top speed, 8.0 seconds 0-60 mph, and a standing quarter mile time of 15.8 seconds with a terminal velocity of 89 mph (143 km/h). Sales were especially poor, with only 400 cars produced.
   The convertible returned for 1964's 300K, but the "cross-ram" engine became an extra-cost option available on the 300K only. A 413 in³ Wedge with a single 4-barrel carburetor, a regular intake manifold, and 360 horsepower (268 kW) was the new standard engine. Leather upholstery was no longer standard either. All this reduced the baseline price by over a thousand dollars, and sales responded with the largest total ever; 3,022 coupes and 625 convertibles.
   
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