I need disc brakes so large sale

I might need the flex plate, but not sure... I'm going to try to do a little research to find out. I have a 1991 pickup as a donor vehicle. It has the 360 I need for my Dart. The truck is a complete, driving vehicle, and I can take whatever I need from it. Of course it has the flex plate and torqu converter already, but I don't know if it will work in my car (?) I can take the whole tranny if there is any advantage, and if it will bolt up I my car.