The fact that the head is getting thin at only 205cfm makes me glad I never wasted much time messing with 318 heads.
The old Dulcich junkyard jewel 302 heads reportedly flowed 215 with 2.02 valves.
They got 400hp out of that thing, but I believe that was before the “discovery” that the barometer at Westech was pretty far off, and the correction was about 5% happy.