Most a-arm suspensions will, from the factory, have the lower arms pointing just a little downward from level (meaning the car is about an inch or so higher than it would be at the point where the lowers were level, and sight that from the pivot points not the a-arm shape). You'd have reasonable clearance and that puts the roll center up around the crankshaft centerline so the car won't pitch or dive around in corners.
You'll need to change the springs, spacers are available but nothing I've used seem to stay in place. Coils commonly interchange among GM cars, just measure wire diameter, loop diameter and height and expect to take a couple trys to get it right. Most will say get new ones but that doesn't guarantee the car will come up the right amount either, the first time.
Rears, same deal.
But you won't be able to cruise around humming Low Rider
anymore. Think about that...you might miss it.