I have always seen them natural.. What I do is clean them up and stray some satin clear on it, like Krylon Matte clear you can get at Hobby Lobby, etc. You get the best of both worlds, natural look with corrosion control..... Here's my former '68 Hemi Charger R/T's front end..

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Troy
Houston Mopar Connection Club
'69 Charger Daytona 440 - auto - 4.10 Dana (now with 426 hemi)
'69 Charger 500 440 - 4speed - 3.54 Dana
'70 Road Runner 383 - 4speed - a/c (now with 440)