Love the direction of your build. I'm not remotely an expert, but to give you an opinion on your question above, if it were me, I would "just clean/de-rust and leave it as-is to maintain the original finishes to preserve that low mileage look" as you stated.
Best of luck.
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1968 Camaro Ex-ISCA Show Car - Sold 
On The Lookout For My Next Classic...
John 10:30
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