Stick to OEM gaskets if you can.
There is the centre plenum gasket.
https://zcentre.co.uk/product/300zx-nissan-oem-plenum-gasket/
https://conceptzperformance.com/nissan-infiniti-nissan-oem-upper-plenum-gasket-nissan-300zx-z32-a4033-30p02_p_677.php
2x Throttle Body.
https://zcentre.co.uk/product/300zx-nissan-oem-throttle-body-gasket/
https://conceptzperformance.com/czp-throttle-body-gasket-52mm-stock-size-nissan-300zx-90-96-z32-a6175-52-z32_p_3421.php
1x IACV valve gasket.
https://zcentre.co.uk/product/300zx-nissan-oem-aac-iacv-valve-gasket/
https://conceptzperformance.com/nissan-infiniti-nissan-oem-aac-idle-air-control-valve-iacv-valve-gasket-nissan-300zx-z32-23785-40f00_p_2028.php
Balance Bar O-Rings.
https://conceptzperformance.com/nissan-infiniti-nissan-oem-300zx-balance-tube-o-ring-set-z32-14033-30pkt_p_1110.php
2x EGR Tube if its still connected.
https://conceptzperformance.com/nissan-infiniti-nissan-oem-egr-tube-to-plenum-gasket-nissan-300zx-z32-14719-30p05_p_4993.php