freeze plug leaking

It can be done from underneath without pulling the engine. I did lowers on a 66 273HP using a small shop hammer to get the plugs started. Then I went to a 2ft long piece of 2x2 and a 5 lb machinist hammer to drive them home. The Mopar needs a deeper plug than Brand X, otherwise it won't seat right. One of the reasons I got the 66 cheap was the PO couldn't keep plugs in it. A bolt-in he had installed would blow out if you revved the engine past 2500 rpm. Consequently, I'm not a fan of bolt-in plugs.