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Tom, I inserted 4, 1/2 bolts where the Manifold Studs would be, thus aligning the Mounting Holes Center. Ran a Bottom Tap in the Threads, used air to blow them clean. Than I put Red Lock-tight sealer on the 2, 7/16 x 3/4 x 18NC bolts w/ lock washers that hold the Manifolds together, and tighten them up real tight. The 7/16 bolts are New Grade 8.
As I mentioned above, it is going to be Surfaced at the Machine Shop. I did take a Machinist Straight Edge I have, placed it on the holes, Both ends I could slide a .005 Feeler gauge under the inside edge, the others were pretty flat. This Exhaust Manifold has the Reinforcing hump on the Outlet Elbow. I do not think these manifolds have ever been machined.