There were many companies and shops that ported heads back in the day. Some may not know it
but Crane Cams offered fully competitive ported heads directly from their catalog. These were called
"Super Port Flow" heads and were also known as "Fireball" heads. They featured round exhaust ports
like most professional porting shops were doing back then. I have an original set of these Crane heads
I'm using on my '67 race car.
These pages are from the '67 Crane Cams catalog.