I didn't realize they sat too tall. Been there. Most of the springs listed for both the Firebird and Camaro will have them sit too tall by 3-4" unless you have them made custom.
You could use a CS6308 It is a 380lb spring and will put you at the correct ride height. They are also easier to install because they are shorter than the wrong ones that it seems everyone carries.
It's available for order locally for about $70 and is listed as a Heavy Duty or With A/C spring for a Nova 4.1L
I have them in my 6cy4bbl car and they seem more than enough to support a pontiac v8. Most of the OE v8 springs were rated about 350lb i think.
