What are the precise alignment angles for the above, with factory air
conditioning, 5 liter engine, automatic 4-door sedan

Nuna-ga

It's your lucky day... Oddly enough, we have similar names, and
similar needs! We just got done realigning my own car, and in that
process had subscribed to a service for 15 days that lets you get
alignment specs. Therefore, since I have about 12 days left on my
subscription, I got you the ones for your 1990 Caprice as well.

Left Side	 FRONT	      Right Side
2.80° ± 0.50° 	 CASTER       2.80° ± 0.50° 
-------------------------------------------------
        Cross Caster: 0.00° ± 0.50°
-------------------------------------------------
0.80° ± 0.50°  	CAMBER        0.80° ± 0.50°
-------------------------------------------------
       Cross Camber: 0.00° ± 0.50° 
-------------------------------------------------
               TOTAL TOE   	 
  	     0.10° ± 0.20° 	 
  	     0.05" ± 0.10"
-------------------------------------------------
Left Side	REAR	      Right Side
  	       CAMBER 	 
  	      TOTAL TOE 	 
  	  	 
  	  	 
Thrust Angle: 0.00º ( ± tol. not specified)
-------------------------------------------------
Additional Specifications 

Recommended Alignment Procedure: THRUSTLINE 

Ball Joint Testing:  
Upper Joint Testing Method: Type 1
Ball Joint Inspection

Type 1

Ball joints must be checked for excessive wear before an alignment is
performed.  Also check the rubber grease seal and grease fitting if
applicable.  The load-carrying ball joint usually wears much faster
than the non-loaded ball joint, but be sure to check both.  Replace
the ball joint if excessive play is found.  The following procedure is
commonly used for testing SLA suspension types.

This SLA suspension type is found on most RWD vehicles. The spring (or
torsion bar, if so equipped) is mounted so that it acts on the lower
control arm, making the lower ball joint the load-carrying joint, and
the upper ball joint the non-loaded or follower joint.  Load-carrying
ball joints, that do not have wear indicators, must be unloaded before
checking for wear.

Place a jack under the lower arm, near the ball joint end, and raise
the tire off the floor.  Check the lower joint for axial play by
moving the tire/wheel assembly as indicated in Figure 1.  A prypar can
also be used between the lower control arm and the spindle.

Check for radial play in both lower and upper ball joints by moving
the tire/wheel assembly as indicated in Figure 2.
--------------------------------------------------------------------
Upper Ball Joint AXIAL Tol:  No visible movement.
--------------------------------------------------------------------
Upper Ball Joint RADIAL Tol:  No visible movement.
--------------------------------------------------------------------
Lower Joint Testing Method: Type WI
 Ball joints must be checked for excessive wear before an alignment is
performed.  Also check the rubber grease seal and grease fitting if
applicable.  The load-carrying ball joint usually wears much faster
than the non-loaded ball joint, but be sure to check both.  Replace
the ball joint if excessive play is found.  The following procedure is
commonly used for testing various suspensions with wear indicator ball
joints.

Load-carrying ball joints with WEAR INDICATORS should NOT be unloaded
when testing for wear.  The vehicle should be at rest on a level
surface as shown in Figure 1.

Clean the grease fitting area and visually inspect the boss into which
the grease fitting is threaded.  It should protrude beyond the face of
the ball joint as in Figure 2 (approximately 0.05" when new).  If the
boss is flush with the face or recessed by any amount, the ball joint
should be replaced.
---------------------------------------------------------------------
The Lower Ball Joint has a Wear Indicator
---------------------------------------------------------------------
Lugnut Torque: 80 ft.lbs.
---------------------------------------------------------------------
The site I used was 
http://www.alignmentspecs.com/aspfiles/IE_Index.asp

Which, as I mentioned, I could access the information due to my
subscription. If you would like a subscription, or have any questions,
you can contact them at:

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Could not ask for more. My first time with this service, but have
nothing but praise. Prompt, detailed, precise. Thanks

Thank you for the rating and the generosity of your tip. I am glad I
could be of help.

Nenna-GA