H, the stance of your GT-R looks great! After looking closely at your photos and those from Ron McCall, I have been contemplating raising my front splitter. The splitter hangs 1” lower than the chassis and the bolt heads decrease the clearance even further.
Can I raise the radiator 1” and still have clearance at the hood?
Sure there is room, the splitter re location realistically lifts the very front of the splitter about 1 1/4" and 1" at the tub.
You will have to re work the rad mounts but you really need it to fit as tight top to bottom as possible, so once the splitter is modified and re assembled with the front re fit the rad at whatever angle best filled the gap.
You will need to change out the top outboard rod ends to high angle ones from Speedway Motors, part # 1750606 (make sure your shoulder bolts are 2 1/2" of shoulder as I've come across some 2 1/4" which you will need to change out) you may need one similar for the track rod end you'll have to check.
Ive lifted and spaced out the top front damper mount at the same time, one inch higher on the tub and 3/4' out should do the trick on yours. this also allows you to remove the top damper bolt without having to dismantle half the suspension.
Depending upon how radical you want to go you may need a shorter rear damper or risk running out of travel, the car comes with a QA1 DS 303 I went with a QA1 DS 301 but you may get away with a QA1 DS 302.
Once you commit to getting the car stance down you have to be fairly aggressive with trimming of returns around the wheel openings so that the wheels have room to move, so make sure your wheels are well centered in the arches before you start.
Let me know if you need any more detail
H