I've just discovered this old thread whilst wondering exactly the same thing as the OP.
Abrams is also on the even more commercial That Is Why You're Overweight, although he's less of a presence there than on Instant Death.
For added AACM points, that album, once it's worked through its funk and comedy tracks, has a track of near unaccompanied solo saxophone by Eddie Harris towards the end. It's an odd thing to find on what's otherwise a funk record.
Does anyone know of any examples of Harris playing free on record, with this group or otherwise?