Would you paint aluminum radiator?
I painted mine satin-black with BBQ spray-paint. Every exposed molecule got paint, even the fins;all of it. I like black rads.
You didn't have that choice in your poll so I couldn't vote.
I painted my 367 Orange.All of it; aluminum heads, aluminum intake, aluminum covers,everything except the carb and headers. Every last exposed molecule. Why Orange? weren't 360s black? I like Orange. And I like satin-black.
In other words do what you like.