What is the thickness of the orginal Exh. manifold on a 69 sml Blk car Where the power steering S-bracket bolts to the exhuast manifold(first bolt on drivers side). My car did not have the orginal exhaust manifolds and I'm converting to powersteering and installing headers. When I mock the fit up it appears that I could use a 1" spacer or 1 1/2" so I want to get the proper dimension for reference.