Porting DC Stage IV iron heads

I scored a set of pretty cherry NOS Stage IV Direct Connection iron castings and would like to have the porting optimized for this unique (wider intake port at the pinch) casting. Is anyone aware of a CNC program in use that is specific for the Stage IV, or a porting service/individual that is familiar with them? I wouldn't want to ruin these rare-ish castings with "experimenting." I can get the bowls/seats "roughed-in" for the bigger valves I want to run before the porting/blending begins. Thanks in advance.