water in the oil

Thanks for all the replies.
First, the heads have not been pulled since I've owned it. It was running really strong with no cross contamination issues.
Second, I do believe it may be the intake gasket. Just didn't want to pull it if I didn't have to. BTW I can see places on the intake gaskets that are discolored. Most all of them look like where oil has leaked out of the valve covers. This due to not tightening them while setting the valve lash.
Third, Like I said I have two bolts that will spew coolant if I take them out. Most definitely will be sealing those! Thanks!
Forth, Pulling the plugs is a great idea.
Fifth, I can not get to the date coding on the block due to the headers being in the way. :)

Thanks for all the replies. Very helpful!