I had H&R on the Z33 and the rule of thumb with the Z33 was that anything over .75" drop in the front would require an upper control arm, IF you want to save your tires and bring the specs back into OEM range. Dunno if that holds true with the Z34. Do a search on Eibach as Lou@Amplifoed posted OEM specs and specs after Eibachs installed, it should give you an idea if you need em or not.
You def want a rear camber kit. I have heard a drop with Eibach (.9" rear) will eat up the rear tires.
H&R paired up with Koni yellows was a good match, which is what I was running on the Z33.
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