My 70 K5 that I picked up last February had set for advertised 4 years but closer to 6-7 and has very little rust. I got it for $600 and I felt it was a bargain. Replacing all the rubber lines and getting a truck that has set for a few years takes a bit of money and usually helps keeping the price down. I'd start at $500 and see what type of response you get. It sounds low but that Blazer sounds like it needs a fair amount of work and rust always helps keep the price down.
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1970 Blazer with a 400 sbc and 4" lift
1980 Pontiac Trans Am, 455 Oldsmobile
2012 Kawasaki Concours 14
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