Certainly not. The rubber seals can be re-used if they are not brittle (bend them; if they crack bin them, if they don't re-use them).The three bolts that secure it should only be tightened very lightly and always use new and correct copper crush washers (not copper seals). If you're getting leaks from here after employing the correct method then you may have a problem with the cylinder head face not being flat but it's most unlikely.
