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Dad, we just used flat tops in the 250 we did all the dyno tests with, so that should put you right on the mark for the needed compression and HP level you are looking for. Clay Smith, Isky and a few others have a good selection of flat tappet cams for these engines. Tom Lowe also manufactures his own brand of intake manifolds for these engines, PES, and has a matching set of "lumps" to match. This combo is 40 HP better than the Clifford intake with any other brand of "lumps", so that will give you a big boost right there if you choose to use it.
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