Welcome... Sounds like you want to do what I have done. As most of the guys have suggested replace all your bushes/rubbers with nolethane ones. Unless they have been replaced at some stage earlier your existing ones are likely to be deteriated/cracked and not that great.
Instead of 'flipping a leaf' in the rear I had the local suspension shop reset them. Means that now ute now sits slightly lower than it did before with 2" lowering blocks.
Replaced the front springs with the 'low option' from the king springs range.
Finally I swapped the original sway bar with a 120y bar. This is an easy swap for a great gain, hardest bit is finding one. I did however do a little write up on how to do the swap which might help you out.
http://datsun1200.com/modules/newbb/v ... id=399819#forumpost399819Good luck.