74 Chevy truck

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I am supposed to go look at a 74 Chevy truck sitting in a barn for many years as soon as the grandson of the deceased owner gives me a call .All I know about the truck is that its a 74 step side and it still in the same barn for many years. I dont know what drive train or whether it is a long or short bed as all I can see is the very rear sticking out of the barn. What are the problem areas on these trucks to look for ? Cab corners ,rockers and what else should I be looking for rust wise? I was told it would be cheap but Im not sure what his version of cheap would be and it has not been started in years.
Thanks John

PS : I really dont need another truck as Im doing a frame off on my 72 but I cant seem to resist the urge to go see it.