do everything at once to save some time and money on re-tunes.
I bought a stockish car and went down a similar path to you. First off i fixed any mechanical issues with the car like brakes, belts, fluids, 100k service. Make sure the engine is healthy to save you pulling it apart during the build up.
Then i collected...
turbos GT-SS
injectors (sard)
cam gears (arospeed)
fuel pump (nismo)
afms (nismo)
dumps (tomei)
Power FC
02 sensors (nissan)
metal cat
Coil packs (splitfires)
....and fitted everything apart from the turbos/dumps and cam gears myself to again save money. I paid a little extra and went for some nismo components for ease of install.
im still hoping to run a mid-high 11 with a bit over 400rwhp.
The car already came with a twin plate, exhaust, bilstein shocks, eibach springs, ARC cooler and Greddy hard pipe kit.
I know its an old engine but it makes power early which enables me to keep revs below 7500rpm, hopefully prolonging its life a little longer.
I only boost once oil is over 70 degrees celcius also.
Welcome aboard Rory!