Given the age of the housing, I would be more inclined to get a new pump. But this time, I would strongly recommend a two speed.

Since you have two skimmers and a main drain, you might be better off with a 1 HP Superflo. Plus, it is a 230v pump which I suspect is the same as your old pump (?). That way you won't have change the wiring as well. But double check your current pump voltage setup.