THOUGHTS ABOUT THIS INSULATION?

Yooo wuts good everyone...Hope everyone has been blessed and well. Got a bunch of this new OWENS CORNING Thermafiber mineral wool from some fire cabinets at work. Was thinking of using it for insulation in my 73 Dart Swinger for the fire wall... floor...doors and trunk... Would this be a good idea or should I just trash it? I'm currently installing a new wire harness in the Swinger so I have everything off the car ( motor...seats..ect.) Hoping to hear from everyone's opinions before I make a wrong move.. Thanx my peeps