I have had one of these manifolds for over 40 years. Used it on an A/SM hemi Cuda and now on a 426 Hemi powered Model A. At the 2014 Mopars at the Strip, when Tom Hoover and the Ramchargers autographed the dash. Tom Hoover said he never could get that manifold to work the way he wanted. Oh, and by the way, it will be for sale when I install the stack injection back on the Hemi.