It's not a Maupin date, especially not JEWEL IN THE LOTUS, which is nothing like this. I did consider one of his two Mercury dates, but those are ruled out with the info now given.
I'm wondering about the guitar player now, having given up on any & all percussionists that spring to mind, except for Montego Joe, and I seriously doubt it's him. Or Big Black. The guy sounds kinda fumble fingered on the single not runs, but he's got his rhythm chording thing together alright, kinda like he played in a bunch of organ bands that didn't play too much straight ahead material. Might even be an Africa or Carribean cat.
The "west coast pianist" bassist/drummer thing is throwing me too. From 1974, the only names that readily spring to mind are Joe Sample (no), Les McCann (possibly, but Paul Humphrey's been ruled out), Jimmy Rowles (Buster Williams crossed my mind vis-a-vis the Maupin association, but I find no mention of an album that fits this description anywhere), and Horace Tapscott (unlikely, I'd think).
I've got Down Beats in the closet going back to 1971 or so. If this album isn't reviewed in there, then I give up!