70 Dart S6 to 383BB conversion - Cast Iron Manifolds

Just get correct one for driver side (abody 383 or 440) then get a Bbody passenger one or Cbody...HP.....I have a driver side abody 383 manifold $450 ...I need shumaker tri-y headers for 71 demon with 400/727
Seems like what I'd pay total for both sides I can buy headers with correct fit? Thx Mtrhead.