GLMKE, I could not agree more with what Bob (supereal) has to say here.Water pumps are like headlights. When one fails, the other will be close behind. As said above, you will find a hidden bolt inside the inlet. Use a six point socket to remove it so the head isn't rounded. We replace those with a stainless steel bolt. Most good hardware stores have them, so you won't have to order. Skip's new turbine style pumps are a good choice for a new pair.
Keep in mind that Skip does not recommend using his pumps with thermostats. So, if you're going to use thermostats, better get the other pumps. Here's "the rest of the story" on that subject: http://www.fordbarn.com/forum/showthread.php?t=106054[/Q
I have 3 sets of Skips pumps, 2 sets on 8BA's and 1 set on a 59A and they do what they are supposed to do. Good quality and long lasting.