Leaking aluminum Mopar valve covers!!!

Well I got the Cuda fired up thursday and my new purty Mopar aluminum valve covers are leaking. I used good Fel-pro gaskets on them and they set flat (after I used a die grinder to notch out a couple of places to clear the intake). Anybody else had any problems with them? I hate to silicone them. I wonder if cork gaskets might stick better? I tried torqueing them down after it cooled down and their tight enough but their leaking terrible at the back corners and a little at the front corners.