HELP!! on 5.7 in a 1969 Valiant

I'm putting a 2008 5.7 in a 1969 Valiant... my question is am I better to get a plug and play kit or get a wire harness like a Hemi hot rod style harness?? I'm using a 727 trans no air no power steering...is the 08 hemi good for a swap??? THANKS