Thanks Andy, I was thinking the stock port cross section was part of the reasoning. How well does the McFarland calculation match up with max torque RPM?

I know what you are saying about the windage trays. I had to really mess with the Jegs 4.15" stroke windage tray/gasket to fit on my 505 RB stroker. Likely would have fit real nice with a stud girdle to raise it 1/4".