I recommend that when you do the intake gasket you properly torque and loctite the bolts, and use a ford gasket with RTV in the corners where the heads/intake/deck meet. Also, replace the O-ring that is located on the dummy distributor shaft plug (where a dist. used to go before EFI).....
While it's out, there's a updated rear main sleeve from ford that will keep it from leaking as this was another common problem
This link has tons of info on stuff like that: