It was really a response to the Ford 427 SOHC and it was more to get that engine banned. After they banned them both, Chrysler quickly killed the program. Only two engines where made and only one complete one survived. They turned the engine over with an electric motor to check valvetrain, but they never ran on fuel. Most of the design came from an aborted INDY engine program that didn't make it.
I would be cool to see one run and get revved up to the expected 7000 RPM capability!