Whats it worth?

[shanerocks]

I have been lurking for a while and have an interest in starting a project. I am looking at a '48 1/2ton 5 window. It is a pretty solid truck not much for rust on the body, floor is pretty much gone, no motor trans or anything except all body parts are there. There are two doors in the box and a grill. Cab corners are good and also has a Ford 9". Basically its just a shell. Guy wants $700 for it. Is this fair? I will probably offer $500 see what happens. My plan is to buy a s10 and swap on to that. I have lined up a s10 LB with air ride and 406sbc with 700r4 trans which I am planning on using as the doner for $4k USD. Is there much that I have to do to the drivetrain to make this fit? Maybe move the motor back?? First build first post. Any input would be great. Thanks