As far as I know there is no "complete" kit available that includes everything you need.
Yes, the tanks from LMC, Classic Industries, etc comes with the tank, the fuel sender, the mounting straps, but nothing else. No extra fuel line, no fuel filler nozzle, no extra sender wire.
These installs are all a little different.
Step side, fleetside, wood bed, metal bed, short bed, long bed. Top fill through the bed, side bed through the bedside/fender, filler located in side marker or tail light.
Search this forum for a ton of threads on different installations. Every install is just a bit unique as are the trucks.
http://67-72chevytrucks.com/vboard/s...d.php?t=771325
FYI - The Permacap website in this thread is no longer valid. Not sure they are still available.