Horsepower doesn't kill drivetrain, torque and how you're trying to put it to the ground does.
If you're building a true street car meaning you'll never put a set of radials or slicks on the car and try to launch it you can try to get away with the 20+ year old Nissan parts.
However the cost of breaking let's say 3 or 4 Q45 or other R230 differentials will quickly exceed the cost of the Mazworx kit which is built to handle over 1,000HP and all the torque you can throw at it. It'll also do that for round after round which I can first hand tell you that the Q45 cant, if you're a seeing is believing kind of guy take a look at this video of one exploding during an event costing them an event.
https://www.facebook.com/mazworxinc/...6850694663112/
Ultimately it's up to you, but I personally have a new found appreciation for the saying "do it right not twice" after trying to save money and cut corners on my own build.