ute 400

Hi guys im based in Australia and i have a Holden commodore ss 5.7 genIII which was currently turbogarged.
I had problems with a cracked bore when on the dyno,reason for that i think weak engine after having supercharger on before,and having problems with detonation lots of detonation tuned by other tuner.
Any way we pulled the engine out and decided to put a 6.0 iron block with LQ4 pistons and heads to drop the compression.
We have built the engine already and installed ready for dyno soon.
I have a few questions since not many people a familiar with these engines

Are the dished pistons in the LQ4 stronger or made out of the same material as the ls1 5.7 flat pistons.
We have here in australia a lot of standard genIII 5.7 engines turbocharged with 10 psi standard comp. running 330-400 rwkws,and no one has had any problems.
At the moment i can not aford forged internals so i thought next best thing would be LQ4 pistons and heads to drop the comp.and make it safer.
If the pistons are made of same material as 5.7 ls1 genIII i should have no problem.
I noticed that the LQ4 pistons have thicker ring lang and are chunkier than the 5.7 genIII.
Does any one know of some one that is running turbo setup on a Lq4 engine,how much boost and power?

Cheers i appreciate your help thankyou.