Demon front end conversion. INPUT??

i have a 73 Dart Sport and i REALLY want to do a Demon conversion. can i take the front end off a 71 72 Dart/Swinger or Valiant and put it on my car. or do i NEED Demon parts. im also noticing my fenders dont have the contours by the hood and grill like the Demon does. do they sell pieces for that and the valance for the chin spoiler someplace?? do i need all new fenders? they dont look the same. i need the hood, grill, bumper, valance and fender pieces. unless there a part of the fender? please let me know