I was told on here that factory reverse lip valve covers would work. Tried real hard to make them work and was never happy. Did some research on my own and out that cometic gaskets makes a valve cover gasket just for the w9s, and it fits perfectly. Then discovered that All Pro makes a valve cover just for w9s. Have recently learned that Doug Lee now makes a w9 specific valve cover also. You can also call Moroso fab shop and they will also make you the correct valve covers. Can you get by with factory pattern valve covers, sure but they don't fit out of the box. Why would you if the correct ones are available.

I've been using the MP performance ones
for years on all my W heads with no issues
(the silicone over metal frame) and they
line up better

Tried those no better! It's not the right gasket, they make the right gaskets and valve covers. It's light years easier to use.

Tomorrow I will take pictures of the mopar gaskets you speak of and you can see how chopped up you have to make them to work, which I am sure you know since you state you have used them for years. The proper gasket requires no cutting, grinding, or messing with. You just take them out of the package and install them. Use the right tool for the job.

Not my idea of fitting, chopped up to clear springs. Silicone on the ends to try and get it to seal better so the vacuum pump would pull more vacuum. Just not the right fitting gasket and didn't work well.