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Once you hit boost,it won't matter much.
The only thing that really matters when working with a casting is the first inch below the valve and matching the intake ports to the manifold. Almost nothing you do deep in the port itself will improve flow more than a percent or 2 and that is only at higher rpm's. Opening up a port will usually just kill flow velocity at lower rpm's. For the purpose of a turbo head,you need to concentrate on anything that enhances lower rpm flow off boost. That is the first inch below the valve. Concentrating on just that will yield ,by far,the biggest performance increases.
Want to further cloud the subject? Ever hear of swirl and tumble?
The local guy that did the porting on my heads for my Fairlane said he preferred to keep the ports smaller to increase velocity rather than making them as big as possible.
NOW YOU TELL ME after all those hours grinding on that head!!!! now see this is the best info to know!