Ins appraisal low, what now??

[walker]

Well I got a call from state farm ins today and they finally got thier sorry butts over to look at my truck, a '67 C-10 lwb. They offered me $3485 if I keep the truck. The body shop estimate came in at $6500. The damage to the truck is:d/s front fender/inner fender, tire/wheel, bumper/brackets, grill/trim, hood, radiator/core support, d/s a-arms/spindle, power steering ram/tie rods, d/s bedside, p/s dent in bedside. That is the basic list of parts that need to be replaced. I went through some catalogs and came up with a rough figure of $3500 in parts if I bought all new stuff. I have some of those parts at home, a bumper,fender, fender well, side trim, hood(dent in the front middle).
I spoke with an appraiser today and he told me that the trucks vaule can be between $4000 and $8000. It only had 86k miles on it, big back window, a/c,p/s,p/b,no rust,
So, what do I do? Do I acept thier offer and make the best of it? Or do I hire and appriaser and take state farm to arbitration? Either way I am out of a car, as they said that now that they have told me of thier offer they want the rental car returned.
I am very frustrated with this as I miss my truck and want it fixed. If I fix it myself it is going to take some time and I will have to get somthing else to drive to work(80 mi round trip). Or I could finish fixing my '67 Scout(needs a new head and emission test)
Thanks for letting me get this off of my chest, any help is appreciated, Andy