No, there were no pizza steaks back then - think they started in the 70s, maybe even 80s.
The only time I remember running into the cheese whiz thing was one night probably in the late 80s we were headed to a Phillies game and decided to stop in South Philly for steaks at either Pat's or Geno's. First I ever saw cheese whiz outside of a supermarket, and, no, I didn't get it.
I know I look far younger than my earthly age but...
Pizza Steaks were available in Mayfair/Frankford in the early 60's...as well as Hoagie-Steaks...but again, I say emphatically, NEVER anything with Cheez Whiz.
Non one misunderstand me here, if someone wants Whiz, then by all means, enjoy. Provolone was always the way to go for me!