The 6 cylinder stuff is going dirt cheap on CL and Ebay, since sane Camaro guys are turning their 6 banger Grandma cars into much better V8 cars (just kidding about the "sane" part). Last year I bought a complete 250 from a '68 Nova 4-door Grandma car (located in Elkhorn City, KY...car had 53k orig. miles) for $250. The car was purchased for its really nice complete front end for a '69 big block pro street Nova, and the 6 cyl stuff would've probably gone to the junk yard if I hadn't bought it. It pains me to see nice 6 cyl cars converted, but it is what it is, and that just makes the few original 6 cars left all the more rare and interesting.