cleaning up the slant six head

A cylinder head guy once told me two things to keep in mind when working on ports. Low lift flow is more important than max lift flow because the valve spends more time there. It's an area under the curve kind of thing. The other thing that he told me was that the short-side radius is where the magic happens.

Personally I'd just gasket match the intakes down 3/4"-1" into the port and leave a small step on the exhausts.