Having played with the Boston funk regulars, I venture to say that this sounds like Denny Ward (Haddad) on drums, Bobby Scimone on guitar, Dickie Scimone on bass, Steve Colt singing, and probably Muzzy Mazzocca or Arnie Barry on tenor sax. Probably somewhere between 1965 and 1967. It is definitely from the Roger Pace/Steve Colt era.