I'm sorry guys, frame swaps have always been a looser. Without a LOT of modifications they are usually a hacked, afterbirth mess. They are not an easy way out, on the contrary they require much more work than simply modifying the original frame. Finding a good original frame is easier than modifying another.
It is like doing an engine swap, the actual mounting of the engine is just the START of the modifications. The exhaust, fuel lines, rad, fan, throttle, clearance issues with crossmembers, drag link, tie rod, starter, distributor etc. is where the real work is.
With a frame it is that and hundreds of others!
For goodness sakes modify the original frame to your liking. 56 Ford F-100 huh? My brother just got our dads 55 on the road after a rebuild. He bought another frame so he could do it without tearing the truck down. He got a kit for the front using Chrysler Volare or something parts. He now agrees that he should have went with one that used GM parts but that is besides the point. Anyway, he put a later rear axle using some soft ride springs that perfectly replaced the originals. The front and rear swaps were pretty easy, provided a nice looking chassis. This truck rides like a car, it stops with disc brakes, power steering, it drives REAL nice.
If you think that these kits are costly, you havn't rebuilt that worn out S-10 chassis yet! It all costs money. If you don't want to spend money, leave it alone. Or just leave the S-10 together and drive that!
Honestly, frame swaps are LOOSERS.