I'm not sure I understand. You mean the stock manifold bolt locations did not match???
J
The bolts lined up just fine. Look at the picuture above, note that there is a relief cut into the gasket surface above each of the four bottom head bolts for clearance. The gasket and stock maifold that I have go right across the top part of this relief keeping it from sealing there.
My first thought was to make a 3/16" aluminum plate and seal it to the head with the round header gasket and then seal the manifold to the plate with stock exhaust gasket. Fortunately I came across some headers that eliminated this problem for me.
Your manifolds may be different, check and see. Not a show stopper, just another thing to take care of when you put it all together.
Doug