One more thing, all I've read says don't try to use air shocks to raise it, they aren't meant to support the weight of the car and can cause some major damage.
I ran air shocks for at least 6 years in my old daily driver. I kept them right around 60-70psi and they worked great, handled well and never gave me any problems or damaged anything.
My old 73 Scamp had KYB shocks up front, air shocks in the rear with 340 rear springs and adjustable rear hangers. Daily driver rain, snow/ice or sunny weather.