I checked the bowl plugs on my 66 Impala quadrajet (7026202) using Cliff's recommended soapy water trick and believe it or not, they do NOT appear to be leaking. Now the dilemma...do I go ahead and remove the plugs to thread in new plugs or do I leave them alone. Cliff mentioned the old bosses may be pretty brittle so I am leery fixing something that isn't currently broken.
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Cliff would be the best to answer this. I believe the older castings used brass plugs and were pretty weak, especially for tapping. I guess, if it ain't broke, don't fix it.