Dermott somehow rings a bell as a old racer but.....
The heads are either OEM Ford (very rare) or Dove re-makes.
From the Dove site:
The Fords ran well during the 1965 and 1966 NASCAR seasons. By 1967, the Chrysler HEMI was back and the Ford S.O.H.C. had been factored out of competition. Ford's answer to the HEMI was the now famous TUNNEL PORT. The new heads had round ports that went straight to the valve, rather than bending around the push rods like other wedge engines. The push rods on the T-PORTS were routed through the center of the port via tube, which incidentally, did not effect the airflow. These new tunnel port heads were a big hit in all types of racing, and gave Ford some of its finest moments. However, the HI-RISER was still king of the shorter tracks, because of its broad power band. At DOVE, we manufacture both the ALUMINUM TUNNEL PORT (#SK-37080) and the CAST IRON TUNNEL PORT (#C70E-6090-K). They are very strong runners even today, especially on large C.I.D. engines.