You can bolt 2.0l heads onto a 2.5 bottom end, with low comp pistons.
But 2.5l heads on a 2.0l? Think about the different size of the combustion chamber, and thus, the head gasket firing ring, compared to the bore size.
I really don't think it could be done.
2.5 is better day to day anyway, you don't want to have to rev it to 5k to get it on boost.
Forged pistons and rods, for sure. Stock crank should be up to the task, with aftermarket bearings, ACL race series, or Cossie.
I don't think it would need to be sleeved for 360hp?
Get some work done to the heads, and get some decent cams.
Definitely need some bigger injectors to push that power safely.
Then you'll be winning.

YOu don't need to buy a crate engine from the east or the U.S. there are plenty of shops in Perth capable of building a good, strong reliable engine for half the price

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i