Help with strange knock???

72 Dart Swinger 340 4 speed with factory discs up front

For quite sometime I have had a strange knock that I feel through the steering wheel. I have a very radical motor so I'm used to it jumping around a bit( occasional header bang etc..) With that said I have constantly kept an eye on my motor mounts and there doesn't seem to be any movement in them. I also once had my steering box loosen up on me and sort of got the same feeling, so I have consistently checked its tightness. So recently I noticed I seem to get the knock I feel in the steering wheel when I am coming to a stop, even at low speeds. I always thought it was my motor jumping around but now I'm starting to think there might be something in my drivers side suspension that may be causing this. I kept thinking why would the brakes make my motor jump around. The brakes themselves are fine, so why am I feeling this knocking in my steering wheel. also its not a constant knocking its mostly as Im stopping and returning to idle, and occasionally when I am sitting still.
Opinions please?