Slant 6 Aluminum Performance Head

If You're willing to go crossflow, then sidedrafts &/or FI are more suited to those goals, with race-length runners. The high port entry desired on the intake would make it easy to put them over the Passenger inner fender, if the racecar even has them, and the exaust can easily be designed to use current /6 headers etc. Other than a Hemi/4-valve layout, there is no reason to contrive a "crossflow" anything. Same with a quench pad, for what? Other than a heart-shaped short-side shrouding to develop inlet swirl, only 170's & race 225's w/zero deck pistons can develop the squish dimensions to turn such a pad into the fast-burn chamber intended.