The rear can be lowered with a simple set of blocks, you don't need to flip the mounting brackets as the rear axle is already above the springs. Blocks are cheap, so you can lower it and decide if you like it. Also, you may find that you don't have enough tire clearance, and that may be why the car's ride height was set the way it was.
In the front, you can lower it with the torsion bar adjusters. But keep in mind that if you do that you'll need a new alignment. Also, if you have factory torsion bars and bump stops lowering the front with the adjusters will probably lead to you bottoming out your suspension too frequently. Which will give a lousy ride and handling.
