Vulture.com talks to Don McGregor about his days writing the Black Panther in Jungle Action: "How an Untested Young Comics Writer Revolutionized Black Panther"
I read his introduction to the Jungle Action - Black Panther Marvel Masterworks just last night.
It was quite detailed and longer than ost: eight pages.
The Warren horror story mentioned as his first comics script is a favorite of mine. It deals with a ghoul who digs up bodies in the cemetery. It turns out that the latest body was poisoned. His poisoner is in the cemetery at the same time that the ghoul is succumbing to the poisoned "meat." Hijinks ensue.