Yes, you can. I think you have to use the Camaro spring insulators (little rubber cup the spring sits in at the top of the frame. Don't worry you'll see them as when you change the springs they will either fall in your face or stick to the spring).
You can also use the 80's S10 pickup springs. There are different rates for the different engines, so you can chose your stiffness.
IROC camaro springs are some of the stiffest and a good swap.
You can also use the Camaro and S10 springs in the front.
They make a cargo coil for the Camaro and G-body also, but you may want to trim them as they may raise the back.
Hope this was helpful