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You may have to run a spacer with the air gap, i modified a 71 340 intake haven't run it yet, but i did mill the divider and slightly enlarge the plenum area, Hit all the turns trying to radius them to a nice rounded turn, then gasket matched the ports as far in as i could get with a 6" bit, also got rid of some of the lumps on the roof of the ports. Then made a larger oil splash shield for the bottom of the intake. Have about 20 hours in it and you would be surprised how much metal was removed.



What advantage to milling the divider???