Freeze plugs starting to go...273 V8

We just did all the plugs on our 69 340. Stop leak probably won't stop any of it because there will be a lot of sludge behind some of the plugs. We went to an engine machine shop here to get freeze plugs (because the parts place didn't have those sizes), and they talked us into the brass ones. I think I saw a better deal on a brass set for Mopars on ebay. The motor is easy to remove & install, but it will cost a lot if you farm it out.