I've got two Q-jets that I have no use for and they're probably decent cores at best. They would need a complete rebuild, I will try to answer any questions you may have if anyone is interested. I have no idea what cores go for, maybe $20-30 each? 7083204 - 1983 G-body 17059259 - 1979 Firebird? This one says remanufactured by Holley. I have no idea what the condition is other than the former is dirty, the latter is fairly clean. Both sat in boxes in my old shed for who knows how long. The top butterflies on the latter have some surface rust, not sure why. Are they worth anything to anyone? If not I'll throw them back in the cupboard.