Good luck,hard to find piece.Find the junkyest cast iron intake you can find at a swap with the fitting on it and buy the whole thing. Manifolds are not expensive by any means. ken ct.
Oh i never thought of it,i got some of those in stock. Its a smaller hole than in the manifold,but pipe thread fitting 1/8" could be used for the vacume,have those too.ken ct. good idea.