Not a direct plug n play. The 67 harness wont have the pig tails for fender marker light. It would also need to be re-wired/re-routed at the bulkhead connectors as they route differently between the connectors as does wire function between the 68-9 dash to engine/lighting harness.
A new YO or CI, M-H harness is probably the best way to go. They are exacting replacements, affordable, plug and play and you're not dealing with old wire that has been exposed to the elements for 40+ years. I don't know if either have any discount deals right now though?
