FWIW...I usually port a head based on many, many things like what the customer wants, rpm, car, converter and so on. I may even build an intake port up in some cases like a 350 chevy using too big a head...if I cant get the guy to sell the heads and use the right one, I may epoxy up the port some and spend less time actually porting, yet the price is more because of the time epoxing and the cost of the epoxy.
Brian