What Color to Paint Engine Block

I'm working on my next build and it includes a "new" LS6 block. Instead of the standard dirty aluminum look, I want a block I'll actually keep clean, therefore I need to paint it a nice color.

Here are the 4 options I'm toying with:

Orange (like the LSX blocks)
Pontiac Blue (basicly "Sky Blue")
Black (rest of the engine bay is black, so it would match)
Clear Coat (I would polish the aluminum first, so it would stay shinny)

Opinions?

ive always liked the chevy orange big blocks in the chevelles. and it would be a nice break from black. just my .02
but it depends if you have any engine bay dress ups?
then i would match it with those...

i say clearcoat...i wouldnt go with chevy orange personally for a aluminum block just becuase when i think of chevy orange...i think of big iron ....