gauge bezel, heater & fuse block ???'s

[Coma]

Ok this is a 3 part question.

First the gauge bezel in my Jimmy looks like crap. It has some kind of stains and is all cracked up. So i got another one in perfect, uncut condition.... Except the aluminum looking stuff is fading off. Is there some special paint to use on plastic, or can i use my gloss black engine paint?

Second, no matter what setting you put the heater on it blows out of the floor and partially out of the vents. It never blows out the defrost. Is this cable or vacuum controlled? What controls it to blow through different vents?

Third, does anybody have a pic or diagram of the fuse block for a 83 K5 Jimmy? The labels are wore off and i can't tell what is what.