Awesome 86 K10

[lloydchristmas]

I'm looking at one for sale here in OK. The truck looks immaculate, maybe one notch below show quality. Owner claims only 75K original miles(it's believable considering the condition), black short bed w/350 manual locks, Windows, hubs and no AC from the factory. It has fairly new 33" BFG AT's. The truck has zero rust, I believe it has lived in California it's whole existence until very recently.
They are asking 10k, seems a bit pricey, but the truck is very nice looking.

Few questions:
Are there any good aftermarket AC options?
Is there anything I should specifically look for in terms of issues with the truck?
What kind of gas mileage should I expect ? 10 mpg?