440 will not fit in duster ? ?? need help assap doing motor now !!!

yes i did trim it and had the tech line on the phone as i did it that is all correct but i just found out it can be my slant 6 k-frame that is giving me issues because even the shumacker mount are not xcatly the same as a v8 kframe and yes the mousnt and everything fit perfect with the headers out , i dont even care if they hit i just want them in.