I've seen guys with sb mopar port matched heads, take the rpm or M1 intake off, port match it and either LOSE e.t. or not gain anything! I've never dyno'd it that way, but this leads me to believe that unless the pushrod pinch is mostly removed, the intake being SMALLER than the port opening is the best it can be.
In other words, if the opening in the manifold is close to the AREA or SIZE of the pushrod pinch AREA or SIZE then any matching will be void.
Just what I've seen....