I had to pull the intake on my 401 to replace a valley cover gasket. The intake gasket I had previously use was a metal core/paper faces type. The Felpro replacement I picked up locally proved to be an all metal gasket. What luck have you guys had with this type and what sealer (instructions recommend it) have you used?? Thanks guys!
Russell Martin (nailheadbuick.com) has a wealth of information on nailheads. Here is the gasket and sealer tech info. http://nailheadbuick.com/tech-info/gaskets-and-sealers
I've had great luck with the Felpro metal gaskets. I hit them with some copper gasket spray, and reuse them if I pull the intake.