freeze plug leaking

3 ? on each side; 2 in the back of the block, remove tranny; 1 on the back of each head.
Once one goes, the rest aren't far behind. Use brass ones. Been dealing with them since 1970. Just went through this with a 70 engine, sitting in the car since 87- saw one pin hole, tapped on some others; drip. no antifreeze, and a lot of crud in the block, it collects at the plugs for some reason, like a magnet.