7-3-6 progression is usually used to go from the 1 to the the 6... In actuality it is a minor 2-5-1 in the relative minor key.
A good example is Marvin Sapp's Never Would Have Made it. I'm only going to post the chords in the progression so you would understand it.. I'll post it in the key of C
LH/RH
1-C/CEG or Cmaj-Never Would Have
7-B/ABDF or Bm7b5-Made
3-E/AbCDG or E7#5#9-It
6-A/GBCE or Am9-Never Would Have
Like I said previously before, it is technically a minor 2-5-1 in the relative minor key of C major, which would be A minor.
A good way to enhance the 7-3-6 would be to use tritone substitution, which is basically saying that whenever you have a chord with a naturally occurring tritone (which in the example above would be the E7 chord, or the "3"), you can substitute the bass note for the note 6 half steps away... so that would mean playing the E7 chord with a Bb in your left hand, which would now make it a Bb13 chord, but that's another story...
