Safe torque limit is around 300ft-lbs, maybe a little more. Most people who run more than that upgrade. Some have run more than that and haven't had any issues.
I ran ~300ft-lbs on stock ALH rods for over a year with a good tune and they're all still straight.
I am running a GTB2056VL right now. - 234hp/370ft-lbs
I was running a KKK BV43A around 190hp/300ft-lbs. Its not a bolt on option for your car. a 17/22 is a good bolt on option for you however you'll need an injector upgrade to get over 160hp.
VNT17 and Stage 4 are a good setup, You can do PD150 injectors from europe to get the most out of that turbo - about another 10-20hp depending on how you you want it tuned