Craig,
As I do not know anything about your chassis or the chassis geometry, some basics.
For a relatively flexible chassis you wish your suspension frequencies to be in the 100-120 cpm range. As I do not know your weight distribution or total weight, I will give a guess at wheel rates. (this assumes a distribution of 45/55)
Front: 135 lbs.
Rear: 165 lbs.
A Java wheel rate calculator
Note: these are pretty high numbers, but might work.
Damper rates need to match the frequencies.
I other words, I really do not know how to set up a car of this type from the information you have given. I can only give you generalities.
Please speak to folks like DV, or some of your local Sprint car guys as they will know much more than I about this type of chassis.
Sorry that I could not help more......