Another vote for Roland Hall. I believe the correct finish would be manganese phosphate. Roland does not offer this process but there are companies that do. If you need a reference I can get the contact info for the company that did mine. 
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1969 GTO 4spd. Antique Gold/black, gold int.
1969 GTO RAIII 4spd. Verdoro Green/black, black int.
1969 GTO 4spd. Crystal Turquoise, black int.
1970 GTO 4spd VOE Pepper Green, green int.
1967 LeMans 428 Auto. Blue, black int.
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