^^^^
This.
The thing to keep in mind is that a port that flows 250 CFM at .750" valve lift is useless to all but a very few people. I think that a port that flows 180 CFM at .200" valve lift and 200 CFM at .450" valve lift would be much, much more useful to a lot more people. If this port had little boundary layer, but some turbulence that would be even better. Best yet would be if it did all of the above and introduced significant swirl to the combustion chamber. All of that is asking a lot of a 50 year old port design. None of that will happen without grinding on a lot of ports and then testing them on a flow bench.
Lacking that tool, the time, and a supply of junk heads to R&D with, the general gasket match suggestion is the best that we can do. And truth be known it's very likely that there isn't a whole lot more to be gained in a head for a reasonable street engine (I'm assuming that the bowls aren't totally screwed up). If you're building a race engine and disguising it as a "street" engine then the effort probably is worth the trouble, but my take on this thread is that you aren't who this thread is for. You already know all of this, or should.
