After installing my coilovers, I had near positive camber on my front wheels, and thought it necessary to correct this. There are two way that I know of to do this. #1 is to buy Adjustable Strut tops from an aftermarket company (expensive), or #2 to buy some crashbolts from Toyota. Crashbolts are the easiest way to get your alignment to show some negative camber. A degree or two of negative camber is good for handling, but generally creates more wear on the inside edges of tires. This is one of the few mods that are legal in the SCCA Autocross rules.
There are really 4 sizes of crashbolts available for 91-92 cars. Stock, Large, Medium and Small. The crashbolts have a smaller diameter on the inside part that holds the wheel on than the stock bolts. Basically, all you do is replace either one or both of the stock wheel spindle bolts for each of the wheels. They are pretty cheap (a few bucks each), and can make a great deal of difference in your cars cornering ability. You can install crashbolts in many different configurations to get differents amounts of negative camber. I chose to install one crashbolt for each wheel, and to use two of the smallest (Toyota Part # 90105-15006) on the top knuckles of the front wheels, and two of the medium size (Toyota Part # 90105-15005)on the top knuckles for the rear wheels. 
Always remember to support the car securely with stands, and not just use a jack. 
Here you can see me holding a crash bolt above the stock bolt I am about to remove and replace. 
Once you have the new one(s) in, and have both bolt loose, have a friend help you by pushing on the top , and pulling on the bottom of the assembly, then tighten them up to at least 150 ft lbs of torque (I reccommend 180 – 200). 
Before and After shots 
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