1969 Pontiac Custom S Series (Worst)
You might have a double take when you look at the 1969 Pontiac Custom S Series. The car is indeed a vehicle that shares a platform with the Pontiac GTO. The Custom S Series was a base model car that came in a coupe, sedan, convertible, and wagon. The performance was far less impressive than the GTO model and the Custom S Series was geared toward value-oriented consumers and families (via Classic Car Database).
The 1969 Pontiac Custom S Series was originally meant to be called the “TC” and would slot in between the Tempest and LeMans in price. Finding one on the used market is not easy, because the car did not sell like the more well-known LeMans model did. You’d be better off saving up and just obtaining an original GTO.