Here is a B body HP manifold that appears to have the part number 2806974, it is in good condition, shows no cracks or breaks and no chunks missing. It came out of a Cbody car so it will fit. I would like $125 plus shipping for it, thanks.
Product ID: EXH2806974L EXH2806974L BIG BLOCK 440 EXHAUST MANIFOLD 1967 GTX R/T LEFT SIDE ONLY Details Original big block HP exhaust manifold, bead blasted and painted cast iron gray. For 1967 GTX or R/T B-body 440, one year only, casting number 2806974 (driver's side only). DODGE PLYMOUTH 1967 GTX EXHAUST MANIFOLDS CASTING 2806974 2806900 1967 440 HP | eBay https://www.ttiexhaust.com/Classics-Ex/MfdCastingNo-383.pdf