I did the trip as well, in my 67 cuda. It was an 8 hour ride, 530 miles each way. Only issues was a drive train vibration the whole way, but not to bad, plus an electrical fire under the dash while I was in Carlisle. The car was parked directly in the sun, windows up all day. I went to start the car and smoke started rolling out from the dash. I think some wiring melted, even the metal under the dash was extremely hot to the touch. Oddly enough, all my stock gauges were pegged as well. So, I pulled the dash out and unplugged the gauges, and then pulled fuses for everything I didn't need. That worked like a champ, and then I drove the 530 miles back home. I didn't have any gauges though, but temp and oil pressure where fine on the way in.
Roadkill style! lol
Glad you had a good trip. I meet some amazing folks as well, and it was sweet seeing so many 67-69 cuda's all in one place!