4. 1969 Pontiac Trans Am
The 1969 Trans Am featured big-block power from the famous 400 V8 engine equipped with the Ram Air III or IV intake system. The difference between those engines was significant since the Ram Air IV featured many improved engine internals and components. But they rated both at 366 HP, which was understated (via Volo).

However, this special version with its signature white paint, blue stripes, and Rally II wheels proved to be a tough seller. Sadly, they only sold 634 Firebird Trans Am. And among those, only eight were convertibles.