No question, pull the dash out as a unit, relatively easy task (there is a posting here in the tech achieves with detailed instructions for the 71-74’ b-body). I have built a couple rallye dash harnesses using both original harnesses and parts from several collected used original dash harnesses, rallye and standard dash. Spent nowhere near what the current pricing is for a repo dash harnesses. There were several minor variations from year to year on that dash.