I drove a box stock 1956 3105 Panel Truck all over the US. I DID see the USA in my Chevrolet! All the wonderful "improvements" you guys have access to now didn't exist in 1970 - 1976. I did add an AM radio, yes, I cut up a perfect dash that I now have to fix, and 7.50 X 16 tube type radials. You can see pictures of it in my Gallery shots. I never had any problems including coming down Teton Pass from Victor ID to Jackson Hole! If your truck is in good mechanical condition, its ready to see the USA! Let it Roll!
best wishes,
Les