Advice on ‘74 Duster

I wonder if they put a v-8 K-frame in or modified the slant frame. Schumacher sells the conversion slant to v-8 motor mounts with instructions. I would take a quick look at it.
TF360, What exactly should I look for and how can I tell? Im sure they had to do one or the other because I don’t think a 360 will just “drop in” in place of a slant 6 without some modifications.

I would think they did it right seeing they put a 8 3/4 rear end in, so many folks drop in a bigger engine and totally neglect the rear end and then when they blow out their 7 1/4 rear they wonder what happened.