You should also look for Geater Davis .... the Westside compi "Sadder Shades Of Blue" (collecting his 60''/early 70's sides for Seventy 7, Luna and Ace comes highly recommended ....
I'm in general not so fond of Blues/Soul Crossover (do prefer either/or) .... btw another exception to my rule is Mighty Sam McLain "Give It Up To Love" (Audioquest) 1993 .... big voiced offering ....
Orquesta La Masacre "New Generation Presenta Julio Castro & Orquesta La Masacre" (New Generation Records) 1979 .... begging for a proper reissue revisited ....