Check Smokey’s books. He wrote about these heads.
I would have to check but if I remember right he said 200 sets were cast to make them legal for SCCA. Chevy was nervous about the Ford tunnel port head 302 making more power so they started on the 302 Chevy porcupine head program. Most of the work done in 67-68. They were working on hi rpm large airflow to take advantage of the large cfm 2x4 cross ram intake in the little 302. SCCA banned multi carb intakes for 69 season so there was not much advantage to the big heads and Smokey and Traco and others kept making more and more power with the stock heads.
As far as Smokey working for Chevy and Ford in 69 – I don’t think so. He had a tight big money contract with Ford given to him by his buddy Bunkie K. who also flew the coop to Ford. GM pulled Smokey’s GMC Truck dealership away from him. They both didn’t last too long at Ford.
Read the books no TV no Video games until your homework is done
