I am trying to purchase the correct stock intake/exhaust manifold for a replacement 240 cu in engine which will be installed in a 1955 1st series GMC 1/2 ton truck. The replacement engine has a cracked exhaust manifold with a 2 1/2 inch three hole exhaust flange. The intake manifold carburator studs are 3 5/8" center to center this engine came out of a 2 ton GMC. Do I stick with these sizes or go to 2" exhaust and 3" center to center carburator studs? I would like to keep the truck stock, if possible. Any advise would be much appreciated.
