Anyone have suggestions about using a 3783244 62-63 250hp wcfb/327 intake manifold on a 1972 307ci. Also, any advice on a carburator for it.

should be very streetable with an Edelbrock or Holley in the 450-500 cfm range.

The only issue using the WCFB manifold is that you will also need a carb adapter to allow the base of the carb to fit correctly on the manifold. With the adapter, you can use virtually any 4 BBL. You will likely also need to reroute the gas line and maybe alter the throttle linkage.