Turbos and carbs work sometimes, but if you are looking for power + reliability PanzerAce hit it on the head, Fuel injection will do more for you and your setup than you can even imagine. If you are still use the l24/e31 or e88 combo, a good headgasket will go a long way too and depending on the thickness, may lower compression which can make it a little less prone to detonantion.
My ideas on power + reliability
f54 block/p90 head (there is no replacement for displacement right guys??)
Megasquirt, the OEM 280zx FI technology is now almost 30 years old on the newest model, megasquirt gives you the tuning ability at an extremely affordable price. Get a pallnet fuel rail and some 440cc turbo supra injectors from a 7mgte to be able to put more fuel in without reaching maximum duty cycle on your OEM injectors (unless you just plan on running low boost for a while)
Intercooler- Lowers IAT (intake air temperature if I am remembering right)
But a lot of your question can be answered with this:
What are your goals and what is your budget?
By the way, I am head over heels in Maximum Boost by Corky Bell. I thought I understood turbochargers until I opened it and was amazed at how much there really is to turbocharging a car.