I've seen stock OM603 turbo engine withstand 30psi of boost from a borg 200 series turbo and a 7.5mm pump, if it bends rods, it is due to a hydrolock.

You will need headstuds and a modified OM606 headgasket for any serious performance use. ARP can sell you studs, but you'll need hardened washers to get the right height, most of their 10mm studs are a bit to long or too short IIRC. A small t3 / t4 hybird turbo would be perfect for the om603, a .48 turbine hsuing with a stage 3 wheel and the biggest s60 t3 compressor or the smallest 60 trim t04e etc with cover. use the small t3 hotside, the integrated mustang and ford turbo outlets are nice, available in 3 inch outlet, easy to use with a stock style spring loaded gate, and cheap as sin on amazon etc.