The Z can be made 2 b fun...but it'll COST ya! At least another $3k+ on top of what ever u purchase the Z34 for.
You're gonna need an oil cooler, oil pressure gauge, rear LSD, metal CSC, flywheel changed to single mass, prob sticky tires...
4.08 or 4.36 gears will keep u = if not in front of 5.slows that are stock...Not for sure how much time and $$$$$ you're willing to invest in a POS nIssan
Paint is shi++y on any MAKE...MPG can be tuned to be better....