Black engine bay's?

If you want you car to look like the factory did. Paint it the same color as the body. But what stopping you their? Throw away the chrome valve covers, their not factory. No unpainted intakes, nope, Did the factory put bare aluminum radiator on you car? No Paint it like the factory. Headers? No mag wheels, Only poliglass tires.
Why stop at one thing??

All that sounds silly doesn't it.
It's your ride paint it the way you want.