I am posting here to avoid hi-jacking the other thread:
One thing I can warn you about if you actually plan to utilize that charcoal can. Using a vac pump, make sure the purge signal valve holds a vacuum. Also make sure the Manifold/PCV port holds it as well (it actually may not, but should). The purge diaphragms can fail and give you a vacuum leak at the PCV/Manifold port. I've installed an external purge valve on both my Eagles and it's worked great.
Where in PA are you? It's possible I could give you a hand if needed. I'm in Johnstown.