Q: Main seals leaking after fixing intake manifold leak the main seals did not leak before

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I just built a 427 stroker on my 1989 fox body mustang. Running efi on a old school intake manifold. My intake manifold had a leak sucking oil in to the manifold replaced and fixed that issue now my main seals leak. I have two valve cover breathers. Do I need to tie in to my intake manifold vacuum to my valve cover? Could this issue cause it to leak. Please help..!!!!!

My car has 75 miles.
My car has a manual transmission.

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