Dart 72 vs 73 susp dilemma

Hey all,
FNG here. Thanks for having me, glad to be here.Have an interesting scenario here and could use some help.I have a 72 dodge dart swinger coupe - manual steering manual & front disc brakes..Car was originally a slant 225 (per fender tag) and before I got it, someone converted to 318 from a 73 (I have checked the block to confirm)When they did the swap, they did the k member and motor from the 73. (and maybe the brakes)Oh and wanted to mention also, the brakes are a slide type caliper if that helps..Now my car is getting older and could use a front end rebuild that I want to do myself then roll to the alignment shop I want to do everything at once, i.e. control arm bush, BJ’s, Idler/pit, tie rods etc, etc
My confusion lies within the swap. First off, I am under the assumption that you couldn’t get disc brakes until 73 so was that swapped in? .
secondly, it is my assumption that most of the front end stuff except maybe shocks are different between the years.
I don’t know dodge so when doing a k member and or brake swap (I cant confirm that the discs were swapped), would you typically convert all the front end to match the K member?
Or… Would you retain the 72 stuff and just swap motor and/or brakes
Or.. worst case scenario, could my car be a hodge podge of mixed year parts?
Thoughts, suggestions, insight or direction appreciated?

Hello Boduke,
First Welcome to the FABO family.
I am not the expert on your questions but knowing from past history when people do swaps not always are all the parts from same make and model.
I have a customer's car in the shop (73) with a 71 K member and disk setup (73).
As a suggestion if you can add some pictures of the components that you have it will help the knowledgeable fellow FABO members to provide the most acurate infomation to complete your task at hand.
Hope this helps in some way.
Stay Safe.
Happy Mopar :)
Arron.