Arizona64,
I'm currently rewiring my 60 chevy truck. I think one of the easiest ways to completely rewire a vehicle, is to get a complete new harness kit. I went with an 18 circut kit from painless wire. They also offer a 12 circut one as well. In fact, they make a kit for your year pickup. My kit cost about $350.00, but it's all worth it. Well restoring a vehicle, it's always best to replace the old with the new. As long as all your switches are good, you'll be in good shape, if you have to replace them, chevy duty's stuff is really good quality.
Superman.