[FC] FC valve covers

[Kevin Clark kgc66@sbcglobal.net]

Hey all,
While I'm draining my oil, I'm ready do replace the valve covers.  
Right now I have 6 bolt aluminum finned valve covers that leaks on  
the passenger side. I got tired of the leak so I have a set of  
standard 4 bolts valve cover to replace. I just realized I have a  
rubber valve cover gaskets with 6 bolt holes. I think I bought these  
from Clark's last year.
Is it safe to use the 6 bolt hole rubber gasket with the stock cover?
Why is it you can't use rubber gasket with aluminum valve covers?
The leaking aluminum valve cover uses paper gasket and it looks  
awfully too nice to replace with the stock covers.
Please advise.
Kevin