If you do a web search on suspension frequency, you'll find some good info. I found this site to be especially helpfull:
Suspension Worksheet | performance-suspension.eibach.com
I have a spreadsheet I can send you. It's for my car (A Factory Five) so the numbers won't be exact. but it might get you in the ball park, and give you something to play with.
Scaling the car could be very helpful. Some people spend a lot of time getting the ride height just perfect at every corner, but that can actually really mess up the balance - which is much more important. Here's a simple way to get the ride height close, and the balance even closer.
- Unload the suspension, and adjust all 4 spring collars until they are just touching the springs.
- roll the car back and forth a couple of times to settle the suspension.
- you can also set the front tires on folded plastic trash bags and turn the steering wheel
- measure ride height. It will not be exactly the same left and right.
- adjust left and right spring collars exactly the same amount.
- measure ride height again, front and rear.
- Make left and right adjustments EXACTLY the same.
- Left and right ride height will not be exactly the same, and that's OK as long as the springs are adjusted exactly the same. If your goal is 4", shoot for (as an example) 3.9" on the right and 4.1" on the left.
I did my car this way. When I got it on the scales, it was so close to perfect, I didn't adjust anything. I was afraid I'd screw it up.