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It's better that a conflict like this happens to us, and not to those who embark on similar efforts. For whatever reason, we encountered this clearance issue between the lower intake manifold and distributor, which prevented us from fully seating the distributor in its bore. (Note the 1/8-inch gap between the dizzy and the bore.) For the record, we've seen countless Trick Flow/MSD combinations like ours that don't have this problem, so we chalked it up to our luck, and proceeded to make the corrections you'll see in additional photos.