The wife and I live in Iowa City, IA, and just returned from a cross country trip in our restomod '66 Sprint 200 vert to Seattle, WA to see our son-in-law graduate from UW. We cruised at 75mph the whole trip, and flew over most mountain passes in overdrive (T5 tranny). The six-cyl engine was rebuilt with several mods including a warm cam and Pertronix ignition. This was our first foray into mountain country so we were not sure how well it would go especially through high passes like the one outside of Butte, MT or Parleys, UT. What we found going up those steep grades was it was necessary to downshift to 4th gear in order to maintain the speed limit but that was all. Much of the car is still stock such as the cooling system (never came close to overheating), and a 1V carb (consistently 23+ mpg). Aside from a problem in the turn signal switch, we traveled without incident. I thought all the 200 owners would get a kick from this post.