[mav1178]

all this talk about parts and no actual discussion about the engine.

the real questions are about what your goals are, not just power output.

How long do you intend to keep the engine?
How many miles per year?

If people can run turbo KA on stock, untouched internals for 10+ years with a basic ROM tune from the mid-2000s, then you can do the same on your SR. The same general rules apply, i.e. who is building your engine, how aggressive your tune is, etc etc...

If you want longevity then you recreate what Nissan had on the SR... a basic tune with failsafes built in to protect the engine.

A lot of the parts discussed here are great, but from what is discussed you don't need more than a clean, proper stock internal rebuild + a good tune done right the first time. What parts you use will probably be dictated by the direction the builder wants to go, and who you use for tuning.