use a touch of indian head shellac on the gasket to stick it to the cover, then install and hand tighten the bolts only - they are very lightly torqued so the gasket is just slightly compressed. If you overtorque it the gasket will leak.
To give an idea - they are "nut driver" tight. - a nut driver is a screwdriver with a socket on its end.
Do not use these clamps on the gasket as it will "dent" it.