Just speaking for myself but on the floor pan and chassis I'd knock the shine down to at least semi matt. But that's me. I'm trying to think back to 1966 when I spent more time under the hood and under the 55 and then 58 Chevys I owned than in the drivers seat and remembering the original color but all I remember is a lot of New England rust lol. Might have been red oxide though with over spray of body color. You don't have to listen to me by any means, just sayin.