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Fleabit peanut monkey
Join Date: Nov 2007
Location: North Canton, Ohio
Posts: 20,833
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CIS can handle larger displacement. 964 cam is a common upgrade when keeping CIS.
If you have your heads done they remove a few thousandths off the cylinder mating surface and than will kick your compression ratio up a wee bit. My US 81 went from 9.3 to 9.5 having six thousandths take off.
With carbs your cam choices increase as non CIS grind cams may be used. I doubt S cams are an optimal choice for a wide power band. Other know way more than me.
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