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Right hand manifold in 67 is the same as 68-69. The left hand manifold is a different casting than the 68-69. 383 & 440 heads are the same so there can be no difference in holes. The difference is in the fasteners used on the LH manifold. I'm not sure about the outlet angle on the LH manifold, but when Don of. Don's mufflers was alive, I had to specify 67 GTX and original manifolds when he made H pipes for me.