ooh the GTI-R chassis is rather unique so there won't be to many parts that crossover. 90s nissans do LOVE to re use parts though so any B14 or G20 would likely be your best bet maybe some stuff from B13 Sentra as well...
If the sheet metal/rad support is to crunched up you may be best off doing a tube front end/custom rad support set up.
Here is a random example from my personal SR20 swapped E30 to help give you some ideas. (this car is all setup so the entire front end can be pulled off in 5 minutes for extremely easy access to the engine.)