I agree with Todd.... sad to say... :>)
Depends on the rest of the car and it's "purpose"... a show car should probably have a matching block to the paint scheme... a street driver - the black the Jody suggested... and to me (personal preference) I'd only ever do chevy orange on a 100% "restoration" if that was the original color.
My buddies black 56 - has a BBC painted a beautiful RED... and with the black inner fenders and billet --- the red really livens up the engine compartment... and is "kinda" like the orange...
So ---- like Todd said -- it depends...