Just a quick follow up - The new part came in today. As expected the lower hose is a BEAR to install due to limited space but it can be done without removing anything, although I was really tempted to remove the radiator hoses that were in the way. When reinstalling the bottom connection be sure to push it in all the way. If the clips wont push in with a fair amount of force it's because the hose is not on all the way. It almost felt like it "popped" on when pushed all the way on, which with the aid of a very long screwdriver and a little prying action against the alternator got it on finally. The rest was a breeze.
For what it's worth, one way to know if your old valve is bad is to blow into it. The old one was stuck open, the new was shut.
Hope that helps!