The only markings I could find on the one head end I can look at is Edelbrock script, Performer, 30 D-215-16
If RPM follows the Performer, it is hidden under the thermactor connection to the head.
These markings do not seem remotely similar to the part numbers
I've found on the Jegs or Edelbrock sites.
Any ideas as to what they mean?
Thanks,
Mike