Greetings ! == It's gasket time !
OK, so a few years ago we had issues with the Fel-pro black gaskets failing in the face of modern gasoline and coolant.
We then very shortly went to the Edelbrock 7xxx series of gaskets and haven't looked back. (depending on setup)
-- For front and rear seals we use a healthy bead of "Right-Stuff" which is an air-propellant silicone. We also will do a small bead around the water jackets, and leave the intakes dry.
The most important things here are cleanliness and dry surfaces ; cleaned with brake-kleen, or isoprophyl alcohol before you start, free of all
oil gasket materiel / and after you put it together torque the intake down 19lbs max for AL intake , 24 Lbs Iron intake.
KEY: Let the whole thing dry overnight 12 hours+ , prior to coolant and any firing up.
Hope this helps.!!!!