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Start by examining your motor mounts on the K frame. Flat "pillow" mounts means (67- oddball idler arm) 68--72 K. The round "spool" mounts means 73 / later K. Now, other than the 67 K, any year K can accept any year parts 68--later, with the exception of motor mounts
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As above determine if it's stock factory 73/ later brakes. Post some photos

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STEERING LINKAGE

Now the steering linkage is a "trick." Regardless of all other parts, there are 4 pieces which must be matched.........

There are two sizes of the spline on the steering box, and this determines which pitman arm you use. And.........the idler and the center link must match THOSE

So steering box, pitman arm, idler arm, and center link all must "match." You can put the 73/ later group into an earlier car, or you can put the earlier group into a later car. Has nothing to do with the REST of the front suspension, nor the K member

Here's a couple of links to the center link "thing"

Notice that the pitman / idler studs point "up" in one group and "down" in the other

http://www.forabodiesonly.com/mopar/showthread.php?t=236925

http://www.forabodiesonly.com/mopar/showthread.php?p=1970108152

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SWAY BAR. If you have or want a sway bar, there are basically 3 situations

1....Up through 72, which mounts below the K member. These require different tabs on the LCA's than 2 below

2....73 and later sway which goes inside the middle of the later K member. As above these require the correct LCA tabs

3....Aftermarket / third party which are usually sold as a kit with hardware to suit whatever they require.