The standard fuel pressure regulator is good to allow enough fuel to the rail to support the motor making 250rwkw and more (we'll soon find it's limits)!
The standard 440cc injectors are really 486cc (as i had mine flow tested). This should be sufficent to run 1 bar boost safely. If you want to do that safely i suggest to fit a Lexus V8 AFM (please refer to Reg Reimmer Lexus AFM upgrade on the net).
Hey 7M-Bris, hows it going, it's me Frank from SA. Anyhow, as much as he hates these motor (i do understand his fustration with these motors as i have experience too), these motors are very good as long as they are respected, no dodgy ideas.