OK, if the adjusters are in the centre of the front suspension beam, and consist of a welded steel bracket, an aluminium block, and allen grubscrews with locking nuts, they are the "Sway-away" type, so proceed as follows:
Jack up the front of the car & support on axle stands under the suspension beam, allowing the wheels to drop, (disconnect the shocker from the bottom trailing arm to allow it to drop as far as it will go), to completely unload the torsion bars.
Slacken the locking nuts on the centre grubscrews.
Now screw-in the adjuster screws the same amount on both top & bottom torsion bars. (The adjuster screw is the longer one which pushes the aluminium block up).
Lower the car to the ground to see the result of your adjustment, and when you are happy, tighten up the locknuts and refit shock absorbers.
If previous owner used "lowered" shock absorbers, they may not have enough travel for your new height setting, so check that nothing is bottoming-out by bouncing the car a bit before you drive it.
Hope that helps