My '51 3600 has the original 216 with about 55k miles. I've put about 15,000 of those miles on it. Longest trip has been 650 miles one way from my home in Sheridan Arkansas to Luckenbach Tx. Twice. Zero problems. Just checked Peyton and looks like you're on the Front Range so no worry about big mountain passes. I wouldn't worry about those is I had to cross any though, just go slow (out of necessity both up and down) and make sure brakes are in GOOD shape.
Three things I always carry on trips, a 5 gal. can of fuel, a jug of engine oil and a gallon of coolant. Well that along with extra points and condenser in the glove box and a do-all tool box in the bed. Oh, and yes my truck is still 6 volt.
At 55 mph your truck will be happy. Two 10'ish hour days and the trip's done.
Good Luck,
RonR
Last edited by moparguy; 06/30/2020 1:45 PM.