Great trip Joe!
I love road trips and the goal of my 68 cuda rebuild is to do a leisurely tour of the U.S. including the mother road. I'm thinking 4-6 wks.
First thing I ever bought off ebay from San Jose and drove it 2800 miles to Ohio. Old cars beat you up and I would stop every 200 miles. I think the key to mileage is OD and I should consider a more comfortable seat.
Sorry I don't know much about Jamie's Dart. Can you summarize the drivetrain and suspension a little here?