You absolutely must check out Survival of the Fittest by the Headhunters. Herbie's group went off on their own and did an album of such stellar funk that I've been forced to come to the conclusion that it's better than Herbie's stuff. Bennie Maupin really streches out, Mike Clark's drums are tight, and Blackbird McKnight shines as one of the very best funk guitarists ever, bar none. A lost classic, and well worth searching out.
Avoid all their albums after Survival, they're just not quite up to the same standard.