There are dozens, or maybe hundreds of half-finished resto mod projects out there turning into abandoned rust buckets. With a lot less work and expense than a frame swap, you can make an original-looking truck safe and roadworthy, and also keep up with most of the traffic around you. The hotrodders with their racing engines can fly by you and collect the speeding tickets, and/or crash when they come to the first unexpected S-curve that challenges their Rube Goldberg aftermarket suspension and steering systems.
Jerry