Intake Port Tumble

What I'd REALLY like to know at this point involves the shape of the guide in the bowl. If the flow does indeed have spin around the axis of the valve, induced from the curved guide, should the teardrop shape be angled more in the direction of the swirl? Or equal on both sides like a regular port, or just left flat on top as cast?
If the air in the bowl is turned properly and the area behind the valve (the cylinder) does not shroud flow, the air moving through the open intake valve will form a tapered conical shape with the valve head as the large diameter and the cone tapering towards a three dimensional point within the cylinder. (that tid bit's courtesy of Smokey Yunick) Unfortunately the guide, the approach to the valve, and bore diameter in most "normal" V8s restricts that cone development. The swirl port is a way to try and use that energy to minimize the negative influences of the design. If the head had a straight approach (like the Cleveland Ford and Hemis for example) then a simple teardrop streamlines without hurting anything. But when the guide is a long boss and curved, its' my belief that the "seam" of the tear drop should continue the line formed by the angle of the boss through the guide. But as I said, I wouldnt do any more than you have on your heads.
The guide's shape in the bowl looks more like a rudder to me, with the narrow straight areas and deep hollows on each side. The flat area on top looks designed to induce tumble. Odd combination of shapes even for the factory. Again, and no panty twisting intended, what's the best way to proceed in the bowl/guide area on a 308 head?
My understanding is the guide and boss is a rudder to the airstream along the roof of the port. The tumble the design induces is not within the port. It's in the chamber as the air passes the seat and valve and it's designed to re-suspend fuel that has dropped out of the airstream. The shapes are designed to create higher or lower pressure areas inside the port in order to "steer" the air to where it can do the most good. GM took a little different approach with the bowl in the Vortec heads but it does the same thing. Again - Noting the work you've already had done - Don't touch the guide boss or do any more than slightly round off the corners in the existing bowl. There is work that could be done in conjunction with more complete port work, larger valves, a better valve job, and chamber work. But I feel it would only hurt performance with what you have now. Just my opinon there and I'm sure there are those who will disagree.