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« on: March 11, 2023, 12:53:37 PM »
It depends on what someone wants for their car. Price, condition and date codes are all deciding factors for a potential buyer.
Over the past several years, I had and sold a couple of NOS pairs of 289 Hi-Po exhaust manifolds. The '64 dated manifolds sold for $1200 at Carlisle and the '65 dated ones sold for $950 in Ebay. My last set, I currently have, are like the ones in second pic, mid-66 castings. Someone claiming to be restoring a '67 GT350 offered me a few hundred bucks for my NOS '66 dated manifold---forget it. Anyway, I'm under the impression the '67 cars got the later "C7ZE" castings? Mine appeared to be too early anyway for a '67 car?
The ones in your first appear to be used too and are for the early '63 to '64 Hi-Po Fairlanes. I don't recall ever seeing those versions factory installed in any early Mustang.