I found a CLEAN cab how much should i pay?

[Clancy68]

A few days ago I was driving along the road to the store, and i pass this old tow truck like I always do with out much thought. but recently after stripping the paint off my cuurent cab(and finding out that it is basically more bondo than metal) Ive been on the prowl for a good cab locally. I realized that this cab was a 67-72, so i decided to take a look. The Cab doesn't have a spec of rust on it, and was stright as an arrow and i figured it to be a 72 becuase it had the foot parking brake, and the mirror is on the glass not on a bracket. I got the number off the plywood and called. the owners reported that the truck was being sold for $350 to a guy who just wanted the front bumper. so i got his number from them and contacted him. he seems pretty knowlegable on what hes got, and reported it as being a "top of the line cab" a.k.a. it has every original option, A/C, padded Dash, etc. im not sure about power windows, but anyway. hes got a 68 GMC sitting out in his field for $200 which is a pretty good project in itself, except it looks like some one cut a hole in the roof for some sort of sun roof.

So knowing what I have told here... If everything looks good, what should I start the offer at? I was thinking maybe offering $200 with the lever behind it of, "well your selling an entire truck for $200."

any thoughts? ive got $400 in cash at the moment.

sorry for such a long post

--Scott