http://www.nzdatsun.com/ and go to the forums.
The New Zealand Datsun Incorporated Society now has a new website and forum, it doesn't show up on google yet so thought I would let you guys know direct. Obviously it is mainly about NZ but it also contains some collected info from around the net, if you recognise any of your own work, please let us know.
Cheers
Damon
A combination of both is a good idea. Use a small lowering block and then de-arch the spring to set the height you want. That way you are less inclined to have axle tramp (caused by large lowering blocks) and you still have some spring left in the leaves.