'74 Dart V8 swap

K Frame (or conversion mounts your choice but I'd rather have the K Frame), torsion bars (bigger size unless you're racing), Transmission for V8 (auto)/bellhousing for manual, engine of your choice but I'd go with a late 80s/early 90s LA 360 roller block (they can be found in full size trucks and vans), correct kickdown linkage, exhaust system (pipes, manifolds/headers).
Other stuff as well but my brain doesn't wanna work right now.