Be very carful not to over tighten the valve cover bolts.
They are a stepped collar design (see link below) and can snap, leaving the threaded portion in the head.
Also, tightening them a little more will not increase the clamping force between the valve cover and cylinder head.
If it is leaking, the rubber gasket has shrunk and needs to be replaced.
https://conceptzperformance.com/niss...1a_p_25546.php
Good luck with whatever you decide to do
