There are all sorts of alignment settings that some will argue will make your car perform better. Remember that the 1970 Mustangs were designed with a particular suspension geometry and room for improvement is limited to that design, save for replacing original parts with aftermarket items. So in dealing with the original suspension, there are some very straightforward procedures that will definitely improve the handling of your Mustang.

The wheels are aligned using three main settings: Caster, Camber, and Toe-In.
Caster is movement front or back of the wheel to the frame. Positive caster moves the wheel rearward, negative caster moves the wheel forward.
Camber is the tilt of the top of the tire inward or outward within the wheel opening. Positive camber tilts outward, negative camber tilts inward.
Toe-in is the distance between the very front of each tire.
 
 
1. Lowering the upper control arms by 1 inch is a common practice now, thanks to Carroll Shelby and the GT 350s back in 1965. This lowers the front end but also, and more importantly, lowers the center of gravity for better cornering. Many engineers feel that 1 inch is all that should be used, stating that the suspension was not designed to handle any more drop than that. This also however changes the way the suspension works and varying the alignment specs from stock helps this modification to work better. Sometimes the coil springs are actually cut to lower the front end. This doesn't really work the same and the spring tension is increased, making for a rougher ride. To lower the upper control arms, drill two holes 1 inch below and the same size as the existing holes as shown above.

2. Caster should be set to between 0 and 2 degrees positive. Caster is what makes the steering wheel want to return to center after a turn. The more caster you have, the more the wheel wants to return to center.

3. Camber should be set to between 1/2 to 1 degree negative. This tilts the top of the tire inward and gives the car a more aggressive ability to corner. Basically this puts more tire on the road in a turn than the stock setting.

4. Toe-in should be between 1/8 inch and 3/16 inch.

With these settings and modifications, you will have a safer and much better handling Mustang.
 
Sway Bars and Springs
The basics of sway bars and springs is fairly simple. It just takes some trial and error sometimes if you want the best handling for your Mustang.
Simply stated:
If the car pushes or plows through corners (understeer):
- Reduce front spring rate
- Reduce front sway bar size
- Increase rear spring rate
- Increase rear sway bar size

If the car wants to swing the rear loose in corners (oversteer):
- Increase front spring rate
- Increase front sway bar size
- Decrease rear spring rate
- Decrease rear sway bar size