My old coupe had a locker with a standard a12, hell that would spin up in second no worries, pushed like buggery through corners though. I was young, in the past ive driven too fast on public roads, i guess ive been lucky, many people havent been so lucky. Just respect the car, build it up nicely, take it to track days, improve your time on every outing, look after it and it will do the same for you.
Seriously dont be a dumb arse, lockers are super dangerous on the road especially in the wrong hands, you'll drive hard, do some unco heel-toe, compression lock into a corner, loose control because you've got no skill to ride it out because its your first car, and your seats too far back and you've got your new sick 8 inch steering wheel. Then you'll ruin someones life when you run up over the footpath, they'll become a paraplegic, but you'll be fine, just have to live with what you've done and the fact your another wannabe racer on the road.
Please, look after the car or buy a hyundai excel or something, leave the datsuns for people who respect them.