Cam/Head Swap Disaster.......

Felpro 1008 and NO copper spay, you should be good to go on the heads. Not sure who said it, but I would also recommend ARP studs as well if you are having issues with head seal, just don't forget to torque them to ARP's spec (110 ft lbs).

Also, may want to check to make sure you don't have 2 oil filter gaskets on the motor...that would cause a massive leak for sure.
Did you get the ARP specs off their website? I have had serious trouble navigating their website trying to find specs for Mopar...