TURNA, this may be of interest.....
http://jeffd.50megs.com/Pump_valve_mod_page.htm
Jack posted that link recently and I bookmarked it. I have a Cardone F41 box and a third gen Camaro serpentine pump that I have to put a hydroboost reservior on so I thought this might come in handy. I'm not sure it has anything to do with your problem since it started out ok and then got progressively worse but wanted to pass this along in case it might help.