And I think I might be missing here sth? This is a picture made from the underside of the factory a/c box. You can see a socket with, what seems to be a broken off hose, maybe part of the condenser drain?The 2 steel lines are for the transmission cooler. They run to the radiator, or if so equipped, an auxiliary cooler. The screw on the modulator is for adjustment. Most modulators are sealed and not adjustable. The vacuum modulator delays the auto shifting of the trans. You can vary the shift point via the screw. If it's shifting well, I would not mess with it. As far as the originality of the floor paint, I will definitely defer to the Pontiac/body man experts.