Need Advice on Bottom End Build

604GZ

Having the timing chain completely slip, finding out the oil gallery gaskets where blown, and then somehow the oil jets/squirter was broken in my oil pan. I got replaced and fixed everything got the car to start of and run fine. I decided to drop the oil pan one more time to see if i would find any more goodies in the oil pan and BOOM a broken piston ring. So anyways i have the whole front end out and decided to just swap the motor got one for a $1000 with on 50000 kilometers. Now that i have this spare bottom end i decided to put a hold on my bbk,air suspension and ect plans to build the bottom end.
So now i have a stage 1 twin turbo kit from gtm love it awesome tune and i am getting 515 the wheels at 11 pounds on the 93 tune but run 490 on 91 tune.

I don't want to run higher boost or anything i think my car is perfect the way it is. i want to keep stock specs. Do you guys recommend sleeving the block or do i not need it for 11 pounds of boost

also what else should i be upgrading to make it a lot stronger and more reliable?

thanks for all your help guys/girls!

Parts list
Weisco Forged Pistons 11:1
Eagle Forged Rods
Darton Sleeves