OK, a couple of comments, and first IANAJM (I Am Not A Jimmy Mechanic). However, I have a 6-110 in Island Eagle, and I have seen some weird fluids in weird places.
So, first, the leak might be coming from around the injector. Jimmy injectors are surrounded with thin copper shields, and these cam deteriorate and leak. Just an idea.
However, second, I would absolutely either get your head rebuilt or get a remanned one. For the 6-71 this should be really, really inexpensive, especially down in your area. Don't bother trying do do anything in place.
Last but not least this is where you want to become good friends with a Jimmy mechanic. Just a suggestion, but what I did was to go to my local Detroit Diesel shop and got the name of a guy who just retired. He knows the 2 strokes well and was happy to come and work for a few hours of cash pay.