Tom68bird, Was the Edelbrock carb on when your engine was rebuilt or did you remove whatever was on and install it yourself after you bought the car? There should be a spacer/adapter between the square bore Edelbrock carb and the spread bore Quadrajet manifold, something like the one in the pic I'll attach below. If not was the 68 manifold modified? You could take off the carb and place a gasket over the bottom of the bores just to be sure there is no restriction of flow from the carb bores to the intake. If not you're good to go. If so you could modify your intake with a die grinder, install an adapter or install the Edelbrock manifold.
