Round the sharp edges back on the 318 heads and go.
Just port matched 302 heads to stock 318 manifold and 318 Felpro 1243 gaskets, there was a little to take out too. Would be interested to see how close a 318 gasket comes to your new intake ports for the fun of it ?
302s before port match
View attachment 1715547682
After port match
View attachment 1715547683