454 magnum blazer????????

[m6z]

I just got a lead on a 2wd blazer in the next town over. I'm told it has a 454 in it and there's a badge on the dash that says 454 magnum? It this some kind of factory offered package or add on? Or is is most likely somthing one of the owners put togeather? Could you get a 454 in a 2 wd blazer?

Thanks for any and all help.