Mlytle, not a problem.... There are still many differences between the 2V and 4V bikes that I'm not keen on either as I don't ride one yet.....
Back to the OP, you should be able to re-install the cover gasket so long as you didn't tear it up getting it off. They are pretty robust.
When putting it back on, don't be chincy with the RTV at the corners and joints where the valve cover meets the timing case cover as well as the half moon areas.
As far as the rubber 'seals' for the cover bolts, if they feel stiff as if they are loosing their elasticity, then change them. The bolts are a shoulder bolt, so when installing them they will break if you over torque them.
The "pressure" that holds the valve cover to the head is the elasticity of those rubber seals. If they start to get stiff they can't maintain the pressure on the gasket, and oil can start leaking.
I changed mine this year, after 20 years, yours could be due just from age and exposure to the sun.