Yes, streamlining the flow around the port restriction can't hurt- - - -just don't get too energetic and grind through somewhere. Enlarging the sides of the port and matching the manifold shape to the wider port in the head might be just as effective at low RPM. Pocket-porting the area under the valves and possibly going to a larger exhaust valve might be an effective approach. On the small block V8 round track engines we went up to a 1.6" exhaust and got as much or more power gain as when we installed bigger intakes. Getting the exhaust gas out is at least as important as getting the intake charge in there.

Getting close to 1 HP per cubic inch isn't terribly difficult as long as a total-system approach is taken. Everything from the air cleaner to the tailpipe must match up, so don't get fixated on only one link in the chain. The biggest mistake a lot of would-be engine builders make is to concentrate on only a couple of modifications without looking at the big picture. Too much cam and/or carburetion has disappointed a lot of people who should have known better if they had stopped to think a little before bolting a bunch of mismatched parts together. Good luck!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!