Gary,
If you are at 489 cubic inches with 15 to 1, you could pick up an old set of 880 center squirters instead of the 660s, but at that level, you should really be looking into a sheet metal intake, or even fabricating your own, it isn't too hard to improve over the factory tunnel wedge. An old friend of mine milled off the top of a tunnel port intake, welded tubes, welded up a plenum and was running an Enderle bird catcher 15 years ago.
Roger
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