My 3 Fav's for various AC/DC Tones into a clean amp and having the pedal do the dirty deed so to speak!
Paul C. Timmy \ nice grit and rhythm dirt \ transparent od sound
Catalinbread DLS \ Rock Mode JTM45 vibe early AC/DC
Suhr Riot \ JCM800 higher gain vibe later AC/DC Back in Black to present
I think the intent of the OP is to find a nice AC/DC sound without diming a amp, not everyone can just plug into a a non master marshall and start blasting to get the Malcom or Angus sound depending on the situation, although it is a thing of legends.