Some Indy 360-2 oval ports, have both exhaust patterns on them. Brett Miller on here did the set of pro comps that went 10.50s. He has a cnc program for them now.
If you go w9 route he has a cnc program for them also. I have been 9.40s on motor and 8.57@162 on spray with his w9 heads.


Brett Miller W9 cnc'd heads
STR Chassis fabraction