I don't know about Autozone but Abc or Oreilly's aren't very cheap. I think those are new chunks though. My local machine shop will sell you a rebuilt 302 long block with stock parts for $850(plus core). Thats pretty cheap. If you are close to Shreveport call Ellis.
I have a guy here in Indiana that has a factory rebuilt 80 302 short block that has never been run sittin in his garage. All new .040 pistons(flat tops with no valve reliefs) reground crank, rebuilt rods. cam. rebuilt by a rebuilder in Indianapolis. Wants $400. Iv'e been thinkin about it myself...Bob