A well fabricated adapter plate can be used without restrictiong that much flow.

As said before, if you want to "do it the right way", build the motor, run an EMS, run bigger injectors, and all other supporting mods.

If you want it done the "simple" way, which 99% of EBay Honda Turbo Kits are geared towards, trust the vendors that whatever turbo they slap on their kit will provide you with whatever it is that suits your needs.... and everyone's needs are not the same.

You might wanna browse Honda-Tech and get some general info about the advantages and disadvantages of different specific turbos one your stock motor before you buy a random kit on EBay.

Anything under 7psi on your motor is a waste of time from what I've noticed. BTW, I have a set of (4) 550cc injectors for sale outta my car if you need 'em. =]