This is a great video from Hagerty (Revelations from Jason Cammisa, Episode 09). It traces the evolution of the 924 through to the 968 with some interesting insights on its initial development and how Porsche kept that development going up to the 968. It’s definitely worth fourteen minutes of your time.
Great information, and further conformation on why the 87-88, 924’s, 944’s and 928’s are the real Porsche’s.