agreed the left is big block "a" year and cid unknown, right side is an B-body HP manifold. perhaps milled to properly fit an a-body but not technically an a-body manifold. Either way still a decent deal, even better if proper head pipes are included.
Correct right side manifold is casting number 2863900 this is for all big block (non-Hemi) a-bodies either 383 or 440 all use same right side.
Left side 67 - 2899002 (383)
Left side 68-9 - 2946729 (383)
Left 69 440 - 3462017
The Accurate left exhaust manifold is clearly fabricated from a b- or c-body HP manifold and not factory. I don't think they are even making it anymore.
