[kach22i]

Miller Gulf Special 1938-39
https://www.classicandsportscar.com/...ndy-500-racers

.....it had a mid-mounted 180cu in blown Miller ‘six’ motor, four-wheel drive, independent suspension, side-mounted fuel tanks and disc brakes – most of which are still seen on race cars today.....................

.........the Miller Gulf Special became the first rear-engined car ever to qualify for the 500.

1955
https://www.classicandsportscar.com/...ndy-500-racers

Sumar Streamliner was, as the name suggests, to be as aerodynamic as possible.

From the next click.

The bodywork also defeated its own purpose by creating more drag, so it was removed during practice. In its ‘naked’ state, the car was quick enough to make the race at 139mph.