I first this sometime back on one of Mr Soul Satisfaction's radio shows.
I managed to hunt a copy down and since then it seems to have become more readily available - just do a quick Google!
Klang provided me with the only information I can find out about the 45:
One of the rarest 45s, originally pressed in 1966 in a run of 3 test pressings, never circulated. BLACK BISHOP was a Bronx (Forest Lawn) gravedigger, whose co-worker Roger Beckman got him in the studio to record this slab of "pre-funk"... Roger also played guitar on these two tracks... recorded on a TEAC reel to reel shortly after one of their few gigs, opening for the Isley Brothers (w/Jimi Hendrix)... rare example of a pre-1967 breakbeat.And the best: this is damn GREAT!!