The fel pro 90109-1 are graphite with an aluminium core they have a compressed area around the seal area i have them on 4 x 340 engines & a ritter plus an r3 none have ever leaked those ones you are having trouble also leach fuel from the intake though the gasket giving a wet look that then turns to paper machete looks like they were made from chairman Mao advertising placards
Correct me if I'm wrong which I might be. They look to be only suitable for cast heads, not alloy edelbrock heads. Port sizing is different I'm pretty sure. Edelbrock head instructions recommend either their gasket or felpro 1213