to do the head swap also requires a vtec computer, oil line to the vtec pressure sensor, the wiring to go with it, and possibly intake and exhaust manifolds (i'm not sure if the non-vtec f-series are the same as the vtec f-series), the proper headgasket, etc. it's not just 'bolt on the head, BAM! VTEC!'
15psi is also meaningless. Air Pressure don't make power. Volume of air does. depending on the size, trim, a/r, inducer, exducer, and so on, each turbo will make different cfm at the same psi.
20psi on a dinky turbo will be less power than 10 psi on a big turbo.
I don't mean to rag on you, but it's obvious that you have no idea what you're getting yourself into. Do a TON of reading and asking before you buy anything, or you'll probably just end up wasting money.