While you are putting the pistons in, you could get the standard rods matched ( as much as you can with one set), lightened and balanced. Get the crank lightened and balanced. Put it back together with ARP bolts. Fit a new oil and water pump. Get the flywheel lightened and balanced. fit a Forge lightened pulley set. Get the head flowed and port matched with the inlet and exhaust manifold. Fit a new timing chain and tensioner. Get the plenum flowed. Get a 3" turbo elbow fitted.
Can't think of much more. None of these things need doing but, while it is in bits, you may as well get it all done so, you have the best engine to bolt a new turbo and other bits to and you don't have to get the engine out again to do it all in the future