64fleetside,
I do not have paint chips for your year (to confirm your numbers) but if your numbers (and names) are corect, PPG has an excellent color library that most PPG jobbers do not know about (or, maybe they do not want to make the calls). The color library can tell you if the original color is still available or, if it is not, they will usually have an "offset" number for a matching color.
Here are some phone numbers. If they are wrong (no longer working) please post that information here.
440-572-6100 PPG Color Library - had all codes
440-572-6111 PPG Tech Services Refinish (gave me the number for the Color Library)
440-572-6871 FAX number for the PPG Color Library
Good luck,
Tim