1970 Dart Accident and need fix up recommendations/ Advice!!

I did the same to my 69 Dart in 1979. Leave it all together and take it to a frame shop, they will take measurements and see if it can be brought back to spec before you remove anything. No matter how soft or hard a hit the inner fender, core support, and possibly the frame rail will need to be inspected and brought back to spec. That is what I did with mine, then the inner fender and right side core support had to be replaced along with the fender and hood. You might get lucky and not have to replace the inner fender and core support, but you never know until inspected by a professional...