i would agree with twinturbo. it would be more suspect if it wasn't mucky they are old engines with cork gaskets so if they they have never been changed then its a normal sight
here is a picture of mine before i cleaned it all up and replaced all the gaskets
come out ok in the end though
welcome to the forum everyone here is very nice and helpful. at the top of each page there is a search button that will drag up the answers to most questions if not then just start a new thread and ask. you will soon get the hang of it.
make sure you check out the Book Amendments and Extra Guides Section as it will make life easier when starting to fabricate stuff.
http://www.haynes.co.uk/forums/showthread.php?t=2430