Oil near intake bolt cracked intake?

[mikey531]

I have been watching this for awhile now and I clean it before each trip. I have changed the valve cover gasket and used permatex. There is no way it is leaking so now I figure I have a cracked intake manifold. I have checked the bolt and it is tight. How serious is this and can I continue to drive it until I have the money to do new heads and intake? I did drive for about 7 hours through the mountains yesterday and that was all the oil that I found.