I would start by joining the VCCA. Four major reasons: 1. The VCCA has members all along Route 66 who have aided travelers on the route numerous times. 2. The VCCA magazine "Generator & Distributor" has ads from members on cars for sale. 3. Requests put into the G&D to help with adventures or projects often receive more offers that can practically be used. 4. In the event of a breakdown, parts, facilities and recommendations are readily available.
I am sure that you will enjoy the trip and the VCCA if you decide to join.