Yes, they will mill all the ports down to the same level. That is the reason for having the manifold milled. The exhaust ports like to erode and/or warp from the heat. If the difference in clearances from high to low ports is approximately 1/8" or less you can probably get away without milling the manifold, all these manifolds seem to warp alittle. If it is noticably more than an 1/8" you will either break the manifold or have leaking gaskets by installing it without milling it first.
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