[David Pozzi]

You could just change the seal, heat probably damaged it. A cooler is a great addition. I wouldn't add a remote tank to your stock pump. The reservoir is removed, then the pump has to be drilled & threaded in a thin area of the casting, so the fitting could have leak issues. There have been plenty done this way, but it's just not ideal.
You could go to a late model pump, but they are no better. Sweet makes late model pump kits.
David