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There is nothing hard about lowering a Datsun, the problems all revolve around Australias obsession with "quick & easy" which usually translates to "cheap & nasty"

We are dealing with one of one of the most important elements of vehicle safety & many just want to mess with something that they obviously have no understanding of whatsoever.

You, on the other hand are to be commended as you are obviously doing your homework & learning as you go & that's something I can admire.

Simply put, for mild lowering in vehicles that are not going to see 'severe duty' then modest lowering blocks can be used but are not really the solution. My personal limit in a small Datsun would be 1-1/2" as this is something like 30 to 40% of the original suspension travel in a 1200 passenger model.

For those who want to get serious, resetting combined with an increase in spring rate is the right way to do it, everything else is unsafe & may be downright dangerous.
Once this fact is accepted, it's a simple matter to make a plan & get it done.