gonna try again

is it in the little sunk area under the intake attaching bolt(s)? My guess is it's coming from the bolts, not the valve covers (unless you missed when you installed the new ones..). Make sure your PCV is working properly. You can remove the bolts, degrease them, and try using the teflon thread sealer or black or grey silicone on the threads. Dont use aerosol sprays to clean the threads, or a tap, as this will just force junk into the engine. This should slo it down enough that it doesnt make mess every time.