and tempts Murphy

Whether to replace all of the core plugs is entirely up to you.  If the engine was out of the car and being rebuilt I would suggest doing them all.  If only one is leaking and the engine is in the car... replacing them all will be a lot of possibly unnecessary work.

Doug, thanks again for the advise.  one more question, do you recommend that I replace all the freeze plugs at the same time or just the one that is leaking?

Great thanks! just as I suspected.

Use a cold chissel to punch into/through the center of the old plug.  Then tap the chisel over sideways to lever out the plug.  Use fine wet/dry sandpaper to remove rust and deposits from the machined walls of the hole in the block. 

To install the new core plug, check your socket set and choose the one that is closest to the plug size.  If your plugs are the cup type, choose the largest one that will fit the inside of the cup without any binding (the fit should be loose).  Then as CC said, apply a thin smear of RTV to both the hole walls and the plug outside diameter.  Use the large socket as a drift and tap the plug in with a hammer.

cup cake..  I have used brass piping.. and drive it in with rubber mallet.. only had to ever replace ONE .of them..  still works to this day..

Use blue silicon.

So i've spotted a coolant leak coming out of an freeze plug.  I've looked in my repair manual but couldn't find any instruction on replacing them.  I just want to make sure there's nothing special that i have to do ie.  do i need to silicone them in or do they just press fit?  thanks.