if you have the mech switch them you will have to realine....
as for being on top or bottom either way works...
only issues with having them on top would be if the tire ends up leaning too close to the shock... but we have plenty of clearance and its not like we need to run a tire any wider then 235-245 on these cars except for front... for drag radials or such...
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96 Z34 (3.4L DOHC RIP PB 14.81@92.2):
www.cardomain.com/id/z34phoenixL36 swap SD header, 2.5" exhaust, HV3, PowrTuner, Wideband, topswap w/ ported heads to be installed