I have a '66 Pontiac A-Body.
What you're describing is perhaps the furthest thing from a performance suspension. No disrespect intended, but it sounds as though you're going for a particular "look" rather than trying to impact performance. The air systems that some here use, like "Ride-Tech" are about as similar to a 2500lb Firestone air bag as is a helium balloon. If performance and handling is your goal, you need to start at the front with understanding roll center, bump steer, the inherent poor geometry of the 1st Gen A-Body upper and lower A Arms. Lowering springs lower your car. They don't fix your handling issues. A lowering spring will lower your CG, but will also reduce travel, and in some cases actually make some of the poor handling symptoms get worse.
In the back, if you want air, call one of the vendors that specializes in high performance designs using air as a spring. At the end of the day, it's a spring, and needs to have certain spring rate, volume and travel characteristics. If you want massive adjustability to raise and lower height, you're going to give up performance. But in no case is a 2500lb air bag - essentially a truck component - a performance suspension.
JMHO.
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