Update...these #2 phillips screw heads were stripped badly. I took a wild shot in the dark and hammered down on the screw head with a long phillips extension bit and sure enough, they broke free fairly easily! Thanks for the tip! I was about to drill them out and said, "what the heck, I'll give the hammering technique a shot". I'm AMAZED at how well it worked. The metal in those screws seems VERY soft. I don't know if it was because of age but they sure felt soft to me. Take Andrew's advice...DO NOT drill out the screw heads!!! You will never retrieve the rest of the screw from the pump body. There's no way to get in there to grab what little nub is left. This should only be used as a last resort!
Congrats getting it out w/o drilling! I agree drilling is a last resort. Who wants to have to clean out the metal bits? Next time (if you do not have an impact screw driver), use a good Phillips head with a square drive on the shaft so that you can push down with one hand and turn it with the other. Much less chance of stripping. Replace those srtipped screws with torx asap.