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If the starting point is a silvertop, just upgrading to a blacktop would be more cost effective. You can probably get most of the gains with a blacktop that you otherwise would with a silvertop with cams.
Those belfab rods for the 7afe are what I would do first. The 20v needs additional displacement more than the ability to rev. Plus, you would most likely not need any aftermarket tuning for the additional displacement.
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