have a delco remy HEI distributor - one of those large body type installed couple of years ago....only problem was that it would not fit with the edelbrock dual plane manifold that was on the motor, so used a torker manifold that the mechanic happened to have in the workshop at the time.... I knew it was not a good idea, so time to make the change..have a 600 vac sec holley on top.... do I go back to the original cast iron manifold with a quadrajet, keep the holley and get a dual manifold that fits???? any suggestions very welcome....