Re: Rat Rod Build Questions...Antique engine???
You might want to check out a local gun shop and pick up some 'browning' solution. It is a stain that is used to 'antique' metal to give it an old look. Gun restorers use it and it might give you the 'look' you want.
I'm sure others will have suggestions too.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"