Doug Nash has gone down in automotive history, and so have his parts. Doug Nash was responsible for the original Warrior style intake manifolds that were found on Pontiac Super Duty 455 engines.
This specific unit pictured is a prototype. It does not have the traditional water crossover style that the other Warrior intakes had, plus the stamping "S-K" is different than any other S-K intake casting we have seen.
There is not too much information on this piece out there at all, so we hope these images will help you in spotting this piece!