Hey Ken I,m using a 42-4501-wh, it is the one you see in mostly every shot of a late gm six hop-up,, the 42-4501 doesnt have the water provision, but accepts a plate for water,,(Tom Langdon has them) and the old castings of that manifold(e-bay)have the provisions for a tap spot for the bell crank, I don't know if the new ones do, but mine (wh) does not,,,
