about to do a ca18de conversion into a ute any tips?

because ill be on my green p's 4 2 years im going to buy the aspirated version and then bolt on an sr20 turbo so i can get about 250hp on 15psi as ive been told the ca18det turbo is only good for 220-240hp. i will be running a ford c4 im also unsure about the diff is a hilux diff the best option i will be runnin a 32 spline axle in it.

note: i intend to race (hence c4 and 32 spline) so i will be using a 50hp nos kit and be running a mild cam with forged internals and an aftermarket haltech ecu, does any1 suggest any other mods like injectors? that i will need