Yes, this definitely sounds interesting, and I've never even heard of it. 
It's interesting to see how many films about black people and by black people where actually made during the 70s but got almost no attention, or were banned. It seems that only nowadays a lot of it has the opportunity to be seen by a wider public. 
Do you happen to know how much research has been made about this period and the films (including blaxploitation) in the US, and if there are any decent publications on this subject.
I watched another African-american film at the cinema about two months ago, but fell asleep and missed almost everything (it wasn't because of the film; I was simply exhausted). But what little I saw and what I heard from the friends who had experienced it sounded like a serious work of art. It was Ganja and Hess (1973).
Anybody heard of it?