Manifold question Part 2 on 2004 Ford Mustang GT

The new manifold is in-I do not note any leaks around the perimeter.Yet,the car is still leaking antifreeze at the rear,and dripping below the clutch.(Prior to the manifold replacement,it leaked by the thermostat and I suspected somewhere at the rear of the motor.
Any ideas? Given the tight motor fit,it's hard for a driveway guy to diagnose.
Thank you.

Asked by for the 2004 Ford Mustang GT
there is a bypass pipe that runs below the intake at the rear of the water pump and exits the rear and is known to rust through & fail.Use a pressure tester and have a good look back there.