You might try removing the motor mount on that side to get in there, but I'd say lifting the engine and trans would be a better bet along with replacing all the steel plugs with brass ones.

 

I've used expansion freeze plugs before.

 

I'd only use an rubber expansion type plug as a last resort and only for a brief period. They always end up leaking after a short while.

 

If you can take that photo, a proper plug tool can easily replace that one. And use proper brass plugs for replacement.

 

+1 to this. I have a similar set that I bought a few years ago after losing a plug while driving. A rubber bung one got me home, but with the use of the tool, I was able to drive in a proper plug with the engine still in the car.

 

By the way, I know it has been said that you don't need sealer on expansion plugs, but it's pretty cheap insurance. I'd use a little "Right Stuff" on the edges...I think that helps lubricate the path to being fully seated as well.

The one that fell out on me didn't have sealer 🤕

 

lol funny story regarding those rubber expansion plugs, years ago I put a rebuilt 455 motor in my '72 cutlass.
and it did have all new freeze plugs. After first drive found one leaking and of course impossible to get to , so I
used an expansion plug. It worked ok until 6 months later I was selling the car and on the test drive with potential
owner - BAM - plug blew out spewing coolant and steam all over. Needless to say potential buyer passed on buying it.
Ended up pulling motor partially out to fix it correctly

 

I got around to fixing this weekend. Old plug was truly barely hanging on. I went tap it out and my punch just sailed through, otherwise cleaned up pretty good.