color match engine to body?

I'm getting my replacement block tomorrow and I'm wondering what everyone thinks about painting the engine block and heads the same color as the car. My engine bay is the same color as the body which is flame red. Do you guys think that I should scuff up the block since it is black from GM and paint it the same color as the body and the same thing with the heads? Or should I just leave the heads their raw aluminum color and the block it's factory black color?