rarest small block intake manifold EVER???

That manifold ,WORKS! Only seen one.A built 11.7 ,roller 340.Lost a tenth,picked up 4 m.p.h.through the traps.The 60' was a tenth slower,tirespin. Auto/x,never heard of Gurney/Westlake Mopar castings.My 1st thought,"ford heads?).Really cool thread.