Looking to buy a truck ............

[tucsonjwt]

Looks like a nice truck. Just a few words of caution.
If you have been lurking here you have read about all kinds of problems with squares. These are old trucks which can and do have their share of problems. So, be prepared to spend money on repairs/"improvements" on any old truck. Even if it has been well cared for, things just wear out and break on any vehicle after a period of time. Normal wear parts (starters, alternators, shocks,etc.) are plentiful and relatively cheap, but some parts are hard to find new and are expensive (HVAC controls, some switches/harnesses, etc.). Many parts for a 3/4 ton truck (like this one) are more expensive than a 1/2 ton truck.
Have you considered a 6.2 diesel crew cab? If this truck has been towing it will likely have a 4.11 or maybe 4.56 rear axle, so with a 454 you might get in the 8 mpg range. Guys with 6.2s claim to get in the 20 mpg range.
If I were you I would be looking for a lower priced rust free diesel 3+3 in S W US for about $3K and put the other $3500 in transportation to your location and repairs. If you want a show truck, then that is a different story. If you want to drive the truck daily I think there are better options. Just sayin'