A 421, tri-power, 4-speed ragtop ’63 Bonneville—if in fact, is numbers-matching—is indeed an extremely rare car, and may very well be a one-of-one model. Reply JP ...

1959 Pontiac Bonneville Convertible Coupe. February 25, 2001 at 12:00 a.m. EST. Share. Add to your saved stories. Save. ... The Bonneville came with a base 260 horsepower V-8 engine, ...