Thank you, the one I am talking about is a 55.2, and yes except for the trucks that have the code on the spec tag there is no color code or record of what it was, just what I have thought anyway.
Are you in communication with that heritage center? It would be interesting what they would say about it.
Do you know what the white paint stick marks that are found on some trucks firewalls mean?
I need to look at my old 58 info kit, if I can find it.