That C20 isn't bad, but its got its share of skeletons in the closet.
Its been bodyworked and repainted before, you can see overspray from not great masking around. Right where the lower trim and wheel arch trim meet you can see white on the wheel arch trim. With the checking and bubbles there is likely suspect body work and or rust under there or incompatible/unstable coating underneath.
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I'd bet there's crustiness waiting in that firewall seam. Just the truth of it.
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And its not a 79 hood, missing the front detail for the 79-80 hoods. Ironically likely one of the easiest to find as until recent years that was all that the aftermarket produced was 79-80 design hoods. The mirrors have been changed or doors changed as it has the riv nuts in the locations for the smaller tripod mirrors.
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Still not a bad looking truck, likely nicer than a lot out in the Midwest/east coast, but its got its share of issues going on. Also the truck OP shared is a C10 shortbed, not exactly the same as a C20, even if it has a big block in it.