Exhaust manifolds/headers can be a neat trick on these cars. Most people don't know this, but the 1961 Thunderbird was slated to get front wheel drive. Ford also contracted out to the Budd Company (makers of railroad cars) to make the bodies (unibody). The specs were to have large fender wells for the drive hardware. However they changed their minds and the production cars had conventional drive. In 1964, with a new body style, they tried once again for front wheel drive, and once again they later changed their minds. The end result is the 1961-66 Thunderbirds with very limited space under the hood, in which they stuffed a 390/428 big block.
This is why they chose a Thunderbird for the movie "Flubber"; the car (only one for the entire movie) was modified for 4-wheel drive, so they could put the car on a lift and show it in the air with all four wheels turning.