New to darts, 1974 dart swinger
The damage is repairable, just search this site & some of these guys do amazing things!!
your car has a lot of life left --if you choose to repair,,
you stated you were going to swap the slant out--
How much can you do yourself?
your frame rail & inner fender are obvious-- 73-76 cars have these-- a few members sell very nice used parts
My suggestion is to search this site & see what other members have done-- then make a plan for you ride & start buying the parts .
Lawrence