Not really up to speed on all things 6 cylinder but it might help to know the cars VIN or when it may have been built.
Have a fair number of original car pictures just don't want to offer any help without knowing we're focusing in on the same thing
Though I think I know the answer want to be sure.
BTW there is a set of pictures (valve cover and air clearer are just visible in one) in the unrestored picture threads. Guess I should find time to add some more examples.
I won't have a suggestion about the closest current paints since I've not done one but hopefully another member that has applied the red recently will