Is your car an Auto? Is see mention of Auto times there.
a Z32 300ZX or R32 Rb20 ECU + Rpm window switch for NVCS is what you need for Nistune/
Mid 13's is possible on sticky tyres and the standard turbo with a tune
I ran a 13.9 with a crap 2.1sec 60ft in my 33 coupe back in the day, I had a front mount, PowerFC and a 3" front pipe back exhaust