at 335rwkw you are pushing well past the limits of a stock rb25
you could stick to under and up to 300rwkw and get an internally gated turbo and save heaps of shit like manifolds , wastegates , custom dumps etc
and forget an autronic , find a 2nd hand powerfc theres even a few new ones floating around for under half the price of the autronic
something like this:
HKS - Turbo Kit - GT-RS AU $ 2,481.56
Nismo - Fuel Pump - Skyline Nissan Skyline - ECR33 AU $ 326.89
Nismo - High Performance Injectors - 740cc AU $ 890.47
Tomei - Pon Camshafts ECR33 Series 2 (RB25DET) - Duration: IN, EX 256 Lift: IN,EX 8.5mm AU $ 684.15
Cooling-Pro Type 1 Intercooler Kit - Skyline R33 GTS-T Price: $449
X-Force Stainless Exhaust System - Skyline R33 GTS-T Price: $950
2nd hand power fc $1200
plus some more bits a pieces but you get the general idea . this sort of setup would pull about 300rwkw or very close too