Valve Covers Leaking

I have a 94 Dodge Spirit with the 3.0 liter engine. The damn things leak
like a dingy. I have changed the gaskets but no change. I did some
research on the net and found that this particular engine has that problem.

I remember reading something somewhere (I'm still looking) about a kit that
will help apply more equal pressure around the edges of the valve cover.

I have asked my local Dodge dealer about it and the guys there said they had
never heard of anything like that. I am not sure if its just not a common
problem or they have selectively forgotten that tidbit of Dodge knowledge in
order to extract more of the publics money.

Any help would be appreciated.