I don't understand why you're worrying about this at 100k miles. My 82 has over 300k on the original radiator, etc. and I routinely drive it across the country. I expect to drive from Denver to Jersey (round trip) three times during January and February. I replace/repair parts at the first sign of failure, but I don't believe it is possible to predict the next failure prior to having any symptoms. What's the worst thing that can happen?