One of my freeze plugs is leaking...

[mweishaa]

I thought I had an oil leak from the drip off of the oil pan, but it turns out it is coolant. Seems that one of the freeze plugs is leaking a little on the driver's side.

What are my options for it? Would stop-leak do the trick or is that a bad idea?
It's a 305 V6. How hard are those to get out and replace with the engine in? I have never done them.

I have a manual (PDF) but I can't find anything in there about them. It would probably say "remove the engine" anyway. But I really don't want to go that route. Any help would be appreciated.