Get a V7 EJ207 short block and use existing heads or recon heads if required otherwise if you use different heads it'll require different sensors, wiring and ecu hugely increasing costs.

firstly the ej207 block is much stronger, as the 2.5 is essentially a bored out 2.0l.

secondly the ej207 v7 comes with factory 'forged' pistons.

basically this block is a lot stronger than the ej257 so you can push it further without having to build the short block.

Most VF turbos are similar in what they output VF28, VF30, VF34, VF35 etc