Well the dash I already have out. I just can't figure out the plenum. I found 2 screws on the firewall in the engine bay, one just above the blower motor in the cab, and one connected to a brace near the gas pedal. Still not coming out. Feels like its still connected at the bottom, but I can't find another screw. How is the drain tube attached?
Some people have done this without removing the plenum, I just don't know how.

And yes, it sucks. A lot.

 

Sorry for the double post. My phone was acting weird

 

Okay... I finally got it in. There was a hidden screw down by the drain tube, and I had to pull the flooring back to get to two screws that were holding a brace. Was able to work the plenum out just far enough to get the evap core in there. Thanks for your responses.