When you do the valve cover, check all your rockers for a proper torque. I've seen some that'll hold the factory torque and some that are loose as a goose with no valvetrain noise. So that'd me my suggestion. It'* kinda hard to tell bc if the valve is open, the rocker is tight, so you have to roll the motor over to check, bc if the torque is still good leave it. It'll be easier to leave it than to remove, degrease, and torque to 13ft lbs [or, tighten until snug, keep going, you will feel you tightening to the point the valve opens, back off and stop once pressure is released from tightening. You will also want to put on a generous amount of blue loctite. This is very important they WILL come loose otherwise.. and it will be naughty if you let it go. The rocker w/o any cam on it [valve closed] will rock just a tad side to side, like free to roam, yet held close to your heart ya know? Also, clean your oil galleys... the two drain holes on either side of the head... and then drain the oil afterwards.
'89 SSE - GX3 -190k, 155k on body - Back for another ride.