I like the Felpro brand
I use an install method that is a bit different than most
but
I don't have any issues such as leaking and the like
I use no glue or sealer on the gaskets
I do use the cork end gaskets
I glue them down to the China Wall with 3M Weather Strip Adhesive
I then use a pea sized dab of RTV on each of the 4 corners
Use some all thread or old bolts with the heads cut off to guide the lower
down nice and straight which keeps the side gaskets from slipping around.
Be sure to retorque all bolts until they obtain an even amount of tightness
This will take anywhere from 3 to 5 times to get the job done
Also ... after a couple of heat cycles ..........
You W I L L find some bolts have lost their original amount of torque

so
It is a M U S T to recheck A L L bolts to ensure they are good and tight
Grady