Matching the manifold passages to the head ports is always a good thing, especially if there is a big difference, but I wouldn't go nuts - you're not changing anything else regarding flow through the engine that would take full advantage of port matching like a hotter cam (are you changing the rocker arms?) or more aggressive extractor so I believe that a port-matching might not gain you all that much on that engine, unless there's a huge difference between head port and intake manifold opening.
Unless you're looking for more to do with your Dremel cable-drive and mini-rasp - You seem to be pretty good with it! 