hey discopotator03 i am running an rb26 plenum on my 25 using the blitz kit. im using gtr fuel rail + injectors. i had to wire in the resistor pack for the injectors. I was able to run the rb25 IAC, the blitz kit came with an adoptor to run it but in the end it wasn't needed.
the AAC value problem was abit of a head f**k in the beginning but what we did was replace the std ACC box with a tube with a number of fitting on it and just connect all the hoses to that.
everything work fine and im running pfc and std loom.
I can tell you that this isn't a easy job, i ended up taking the motor out as there is just not enough room to be able to fit the plenum on once you put the adoptor plate. as its very close to the firewall.
im running the stock rb25 throttle cable but it is longer, so i ended up looping it around in the cabin and making a custom bracket in the engine bay.
I am running an hks oil cooler kit so i don't have an issue with the oil filter as it is on the relocation kit.
The major issue with the blitz kit is that because of the VCT the gtr plenum won't fit the water outlet hit its. so you can remove the VCT or else what they say to do it cut and remove the water outlet from the rb25 plenum and weld it onto the rb26 plenum i did this and it work fine! the std r33 radiator hose still fit (i think it was alittle to long so we ended up cutting abit off)
also if i remember right one of the coolant lines which is used in the rb25 plenum (connects to the throttle body) is not used in the gtr plenum i can't remember what we did with those hoses we might have just loop them together or block them off