Right now, just get it driveable. Wash it, touch up small rust places, fix the brakes, fluids, tuneup, replace split rims on the rear. Most likely keep it as is and replace only what needs to be replaced.
Thank you everyone, one small correction. According to id plate in glove box, it is a 3HD transmission, not a 4 spd.
I gave her a nice spraying off tonight. Not sure what I have yet. Thought I had a nice original truck, but....
The fuel tank is behind the cab on the passenger side mounted to frame, and no tank behind the seat. The filling neck is still in original location on the cab. But neck for tank in use was added.
The color of the cab where the fuel tank should be is a darker color than the exterior. It was too dark to tell exactly but looked navy or black. Door jams, firewall and everywhere else is the light blue color in the pics.
Still has at least two of the original F3 hubcaps, which are hard to find. Don't sweat the fuel tank being on the outside. You can always add one to the original location if you feel compelled. Be careful pulling off the duct tape. You may pull the whole fender off.