What is it?

What car would you find it on?

Correct

Thanks for posting the pics!

The fenders are somewhat wide for the size of the car - but they look good.

This is likely the best looking blackout package of the musclecar era, it's so finished looking. I love the way it wraps around the side glass, hits the tops of the doors and continues down the fenders.

My Uncle had one of these (no shadowmask) with the 390 Go-Pack: it was a quick little car.

That is one beautiful Rambler. A stunner.

Ford was known for their narrow engine compartments as well, for decades, I'd say at least from the '64 Mustang up to the last Fox years.

O.B. How about 1958 & 1959 Fords?

The hood is more like a compact makeup case...