This manifold is designed with two sets of bolts holes so that it will fit both the early style Chrysler heads and later Magnum heads. This is an gap style design which provides air space under the plenum which helps cool the intake charge and produce more power. This manifold includes nitrous bosses, an extra rear water port and is available in either polished or satin finish. This is a terrific all around high performance street manifold. Use our intake manifold gasket #55600 (except Magnum) and #55601 for Magnums. Requires use of 1975 or earlier water neck. Transdapt #4987 or Spectre #4739.