Intake Gasket advice

That was my impression. The factory intake is individual O rings on each port that fit in a groove on the intake. The aftermarket carb intakes (at least my ModMan) are a flat bottom design that's designed to be used with a more traditional flat gasket. I got a set of phenolic ones with the kit. I don't think they seal as good as the factory ones would, but they seem to work fine so far.