Hank, To be fair I think I've already come close enough. When you consider what a good lump port head will cost. According to the Mr. Halls article this head was used in a 1979 L/Gas Corvette built by Olsen and Mattel running a 230 L6 putting out 460HP. Unfortunately no times were given, perhaps some one can find them. Since your in the business Hank call Duggan negotiate a price. Then let's us know.
Larry