Finally Bought a C10!

[Sjo426]

So I've eye balled the 67-72 C10 for years and now I finally have one. It was in impulse buy at an auction, I don't know much about it, looks like the engine and tranny aren't original, and that it had been sitting behind the guy's building for about 15yrs. From what I can tell the only rust is surface rust, albeit some of the surface rust is pretty bad, but I can't find any rot/holes/etc. Anyway, I was hoping you guys could give me a few thoughts or what kind of questions I should be asking myself. I'd like to just make it a weekend cruiser. Thanks in advance!