They look like 69-70 428 Cobra Jet valve covers. They fit on my 69 Mustang with power brakes with the POPs rocker system and end stands, but I had to take the baffles out of the valve covers. Some have "persuaded" the baffles to work with a hammer, or made new baffles. I chose to run a twist in breather on one side, and a twist in PCV breather on the other. Both breathers have baffles in them, so I don't need the baffles in the valve covers.