[bobcowan]

That's true, to a point. You want a small lip in the port, no more than about 1/8" or so. More than that creates a dead zone and turbulance in the port. That will cause the fuel to come out of solution and puddle on the bottom of the port. That's a bad thing.

You should make a pattern on the head ports, and transfer that to the manifold ports. SOme people just use a gasket. Cut out the port opening to match the pattern. Then work that back into the port to create a gentle transition.

Be sure to look down the carb barrels and make sure that port is big enough, too. You want a nice smooth transition there, too. But no lip.