If you are after hp and mgp. Then I would focus your money one flow mods. Ported everything ( heads stage 2-3, blowers, lim, tb). Headers a must. Not going with a cam will make 300 whp hard. I would go with a mild cam like vs or even a gt cam. You will prob need bigger injectors for this power level. A wide band and someone who really knows how to tune, as you will be trying to get more timing and less boost. You will also want a true cold air intake and not an open cone sucking hot air. Upgraded rad and other cooling mods
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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