While the other full-size Pontiacs at the time... the Catalina, Star Chief, and Bonneville ...came in a variety of four-door, two-door, wagon, and convertible configurations, the Grand Prix nameplate was launched for 1962 as a sporty grand touring hardtop coupe.
Bucket seats and a front console were standard equipment, and for 1963 the base motor in the Pontiac Grand Prix was the 389 cubic inch Trophy V-8 with a four-barrel carburetor and 10.25:1 compression making 303 gross horsepower. Optional engines included a Tri-Power 389 making 313 horsepower, the 421 H.O. Trophy V-8 with a four-barrel, rated at 353 horses, or the Tri-Power 421 H.O. Trophy, which thumped out 370 ponies. Both of the H.O. mills boasted 10.75:1 compression ratios.
If you look at the wheels on the Marimba Red example in the photos, those are optional eight-bolt finned aluminum wheels. In fact, the
finned part in the center is actually the brake drum, which also serves as the wheel hub; the wheel is just the rim.
Motor Trend tested a fully-loaded '63 Grand Prix, with the Tri-Power 421 H.O. mill, optional four-speed manual, and 3.42:1 Saf-T-Track limited slip rear end and a bunch of other options. The brutish 421HO was enough to launch the 4120-pound sled to sixty in 6.6 seconds and down the quarter mile in 15.1 seconds at 94mph. The finned drums hauled the two-ton Poncho to a halt from sixty in 147 feet.
All the options pushed the $3,489 base price up to $4,675, which comes to about $51,500 in today's money.