I have 2 friends I race with running them on stroker small blocks. They make killer power. One of them has tried both conventional ported square port Indy's and CNC ported oval port Indys with similar results. The other friend runs the CNC square port heads. One switched from insanely ported W2's got a substancial gain immediately. The other switched from ported W5's and also got substancial gains on the track. One car runs 9.30's at 3200 lbs, the other runs 9.50's.
One of these cars can be seen in the calender in the January 2006 issue of Mopar Muscle, month of June. This picture was taken at New England Dragway