Just take real good pictures of the casting # and date code and you should be able to get around $1000 or more. I've seen single heads for sale complete with valves/springs/etc for around $500 and I've seen complete rebuilt sets sell for $2000 so it's a pretty big range. If yours are really dated 8 and not 9 then it might give you a smaller audience of buyers. Some of the Corvette motors might have been using them in the middle of the 69 model year but that date seems too early.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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