ok, here's exactly what you need to do the conversion to your s13:
you need the z32 300zx NA (TT doesnt work) rear hub
you can use the entire spindle, which saves 8 lbs on either side, but then you need to use 300zx rear suspension (the bottom mount is different)
or you can use s14 5 lug rear hubs
up front you use s14 5 lug spindles and hub
in the front you have to use one of the following to options:
a) s14 lower control arms (i suggest) because it gives you more turning radius
b) the s14 lower control arm bushing
brakes can be either s14 rotors all around, which allows you to use s13 calipers (easier method and cheaper (tirerack.com has brembo rotors cheap)
or b. z32 rotors (if you use z32 rotors you have to use z32 calipers and brake lines due to z32 rotors being thicker) which means no ebrake unless you change that for the z32 one as well.
thats all you need... word of wisdom: if you use z32 rims (16x 7.5 front , TT 16x 8.5 rear) and have coilovers, you CANNOT run wider than a 205 55 16 in the front or else you will pop the tires on the coilovers. they rub. (and still you have to use 5mm spacers)