ITR head & camshafts for civic si 99'

Hieverybody!

I have a chance to buy some extras for (civic B16A2 - OBD2) reasonable price :
JDM Type R Camshafts,
JDM Type R Springs and Retainers
JDM Type R Valves
VTEC Solenoid

For swaping it with my B16A2 head I don`t need anything extra (except gaskets)?
Just bolt on?

What about pistons? Are my stock OK?
Would civic type-r be OK (they are
oversized) ?

What about injectors and ECU are mine OK?
What about the camshafts would they work for my engine?

THX for answers in advance!

everything should swap over with no problems, stock pistons are fine, but since your tearing the motor apart you might as well upgrade em now. with just those basic mods, your injectors and ecu will all be fine.

THX very much man!

Which pistons should I buy (CTR EK9 or ITR), standar or oversized?
What about rods? Are stock OK ?
Do I need a new rocker arms, and rocker arm shafts?

How many HP would I gain using :

JDM ITR head, JDM Type R Camshafts,
JDM Type R Springs and Retainers
JDM Type R Valves
VTEC Solenoid ?

THX in advance

You'll gain about 30hp.

well again, your tearing all the motor apart to put these things in now, and it will only be harder to change later, so the more you do now, obviously the more it will cost but the more your engine will perform.