I want an Indy Car.

[blue00gt]

Before you start doing suspension mods I suggest you decide how much money you can spend and what level of performance you want.
Just buying new stock syle springs and dampers and chassis bracing will only get you so far, and you will never beat alot of the better handling imports.
For the best handling you need to get rid of the stock 4-link quadrabind rear suspension (angled upper arms with rubber bushings are NOT the way to laterally locate an axle or control windup). This means either a Griggs or Maximum Motorsports style torque arm/panhard setup or Steeda 5-link.
I would suggest looking at those manufacturers' websites and also do some searching on cornercarvers.com.
The front is not as hard to upgrade as long as you get the right parts to maintain proper geometry when you lower the car.
I have the full Maximum Motorsports torque arm/panhard and tubular K-member with pretty much everything else they sell and I can tell you the performance is nothing short of spectacular.
Otherwise if you really want an Indy car I can sell you my '79 Mustang Indy Pace Car!