The only "freeze" plug that is exposed to oil will be the one behind the camshaft. The rest of them, including the two large flat plugs at the front and rear, cover casting holes in the water jacket, also the ones down the driver's side of the block. There are two very small plugs (like about 1/2"-9/16") at the ends of the oil pressure gallery. I like to tap those holes for a 1/4" pipe thread and use screw-in tapered Allen plugs instead of press fit ones during a rebuild.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!