I can't imagine why your PPG jobber would only have it in OMNI. Typically I believe they match in DBC and do a math conversion to OMNI formulas. Seems like they could do a spray out for you in the OMNI and use the color computer to back into the DBC. Alternatively, if you have a good non-exposed part (like an inner dash piece) you could take to the jobber he should be able to match it. True original color is a relative thing that far back anyway. There were more color variances back then than today and the shop guys on here know there are still a lot of color variances/alternates coming from the factory.
We'd love the opportunity to work with you on your project. We have a nice selection of golds in the store over here:
http://www.thecoatingstore.com/metallic-colors/