Thinking about replacing/reconditioning the standard turbo on my 4x4 Saph Cos but was after some friendly advice on what to go for. Looking for reliable 330-340 BHP if poss.

Its running:
Low comp (7.53:1) bottom end
Grp A headgasket
803's x4
3 Bar Map
-31 Actuator
Standard cams

I have been told that a T3 turbo with 360 bearing will do the job fine but have also been advised that a T34 would do the job as well and with potential to get more BHP. Then theres the matter of deciding .48,.55,.63 with the T34. Advice welcomed.

Cheers