Just bought this intake. The guy I bought it from stated it was from a superstock car 1966-67. According to the numbers it is an early manifold with CDPC instead of the pentastar. The walls are cut out that looks factory. The book I have states "wall cut" for superstock. So to me it appears real. There is a piece of aluminum welded in. I did some research and it is the Arlen Vanke mod I guess alot of people did for more power at the track. So this is the manifold that would have came on the WO and RO23 cars. Would the factory have welded that little damn of aluminum in? I took off the underside heat shield and found aluminum foil jammed in there. I unwrappped one of the pieces and found what I think is espestos. Not sure. But I am guessing it would have been to keep the heat away for a cooler airfuel mixture. Also what is that big plug for on the underside of the intake? I included some pictures.