From what I can remember...

The F22b is the JDM equivalent to the USDM H23a1.

Now I am completely unsure if the F22b has FRM sleeves or Iron sleeves.
But if it has Iron sleeves, then no doubt I would boost it.

With the money that he would spend to buy a H22 he could build a reliable low boost set up on his F22b.
(considering he has the snail, bov, and IC already)

If he wants to run high boost with low compression forged pistons then he would have to resleeve the block to a material other then FRM. (which can get expensive)

IIRC