Any real benefit e.g. power increase? I do not expect much as the amount of fuel fed will still be the same. Is there anything else I should adjust/swap to actually benefit from that IC?
Time to do some reading.

. With out changing the fueling or touching anything other than installing the inter cooler, you will have a much much more efficient engine. You should notice less smoke, and cooler temperatures. NOW, turning things up.. you will notice it for real.
You should be able to turn up the fuel before having to touch the boost, sure your waste gate will open at the same spot but the power from 0psi-12psi will be great. Having a working waste gate is also a very good thing to not over boost it.