383 into 73 Dart Sport using exhaust manifolds

The C body HP manifolds will fit sometimes with no modification. The only mods I'm aware of is "sometimes" you have to angle mill the driver's side so the outler is a little closer to the engine. Passenger's side falls in. With the C body manifold on the driver's side, there's zero need to cut the steering column housing if you want to retain the column shift.