jeff lauharn, St. Peters, MO , 1971 Plymouth Satellite 383

I have a 71 Satellite, Road Runner clone. After stripping the body for a restoration I am doing in my garage, I found more rust than I had hoped for at the firewall and at windshield bottom corners etc. I have found a 71 Charger, it is banged up but very clean in these same areas, for 300 dollars. I can even use the inner fender wells which I was going to buy reproductions of. I hope I'm not wrong in that they share these pieces, as they look identical and the reference book shows they share windshields etc. Here's my question: I looked under the rear of this Charger and the differential looks like a Dana, or at least it is a rear loaded diff. It was a 318 car and I dont know what the options were on the Charger, could it be a 9.25 dana or a 7.25. It doesn't really matter but I am still indecisive to buy it or not. My chances of finding a Satellite near me in as good as shape as this Charger seem remote, I'm on a budget and can't afford to ship one from the dry climate states.

Thanks for any help you can give me. I hope to finish it in 2 years. Jeff.