Item 1:
     The only difference between the original Avanti and a "II" is the angle 
of the body on the frame, the 79 being more level.  There is a slight weight 
difference, as the GM engine is lighter that a stude, but this is dealt with 
using lighter duty  front springs.  The alignment specs on the above page are 
accurate, pay special attention to the toe-in, as you most likely use radial 
tires.  Be sure that your frame is level before setting the numbers.  If you 
have larger tires in the rear, it will raise the frame up and screw up the 
settings.   In the opposite direction, the rear leaf springs may be weak and 
cause the rear to sag a bit.  Some conscientious alignment shops will  deal 
with this, making sure the tires are inflated correctly, tightening the wheel 
bearings beforehand, etc .    Most likely, you'll have a little slop in the 
king pins, but a good dose of stiff grease can help here before you drive over 
to the shop   
Item 2: 
     Hopefully, you found a shop that knows how to actually set the 
alignment.  There are many that will say they can, but can't find the 
adjustment fittings.   If you have to tell them, then watch them.
 
    The camber is set by removing the grease fitting from the rear cap of the 
upper outer steel suspension pin, loosening the king pin pinch bolt and 
inserting a 1/4 inch allen wrench through the grease fitting hole into a 
recess in the end of the pin.  The upper trunnion, where it is held by the 
kingpin pinch bolt,  is milled on an offset and one complete turn of the upper 
outer equates to a full range of camber and 1 degree of caster, depending on 
which way you turn it.
    The upper inner pin which has rubber bushings on each end, also has the 
frame mounting holes offset and can be flipped over to give more camber, altho 
this pin is usually assembeld with the max adjustment already outward.  I just 
added this in case you may have an odd camber problem, you can look to see if 
the offset is correct.  The bulging side of the pin should be toward the engine.
.