Well, I'm not going to argue flat-head, but I can tell you you'll never get a DOHC motor to work properly in top-fuel! Ford tried to field a SOHC engine for a period, but they were so much more complicated than the pushrod Hemi that the mechanics didn't have time to do what they needed to do between races, and they often had trouble running smoothly on the strip. They only time they beat the Hemi, was also the time they got Ford factory backing, and set a top-fuel budget record that stands to this day.