Valley pan?

I've got a 440 and am using a valley plate from hughes engines - thing is that I can't keep the thing sealed along the length of the heads, and it keeps spraying oil all over - not to mention the vacuum leak it causes. Thinking about going back to a valley pan.

Question - any issues using the stock replacement metal valley pan on alluminum heads and intake? I guess I need to seal it up with silicone too?


One more thing - I bought these heads used, and they were machined to 75cc chambers (Eddy heads) - will this affect fitment of a stock valley pan?