You can do this with bolts but it's easier with studs. Arp studs that you would use for say... a Pontiac oil pan application 'hint hint'. You will want to use a cork gasket if stamp Steel and a composite gasket or even steel impregnated viton like a magnum... what you do is you put a little circle of rtv around the studs 'use the screw on applicator' then sit the cover w/gasket on. The idea is a little rtv comes up around filling the gap between the stud and gasket/holes. I use black for this.