Not sure why the Wayne head is not good as a down draft?
Looks good to me, the port isn't the problem - it's the vertical valve, which is usually inclined another 10-20° to ease the SSR even more, and permit one side of the chamber to be closed completely into a wedge (as Cadillac and Oldsmobile had just done for 1949).
BTW: in the stock head shown, the inclined valve is the exhaust valve, the dotted (phantom) behind it is the nearly vertical intake valve with 90° (horizontal) port.
