I am putting together a '54 Mercury with a '61 292 Y-Block and '54 overdrive transmission. The engine and transmission are installed. I am trying to use the stock '54 Mercury clutch linkage. I have the correct '54 Mercury left side accessory dual exhaust manifold Part # EBU 9431-D on the engine. I attempted to install the clutch linkage assembly but the flat crossbar which goes between the linkage bracket on top of the frame and the engine bracket (which hold the swivel ball) ends up going right across the center of the lower exhaust manifold flange. It would be impossible to mount the header pipe onto the manifold flange with this interference. Has anyone ever put dual exhaust on a '54 Mercury with manual transmission? Was the clutch linkage a problem? Thanks, Alan S. Freeman