You really shouldn't be required (depending on amount of boost you're running that is) to upgrade the pistons, rods, etc...You WILL have to upgrade the fuel system. With a turbo you're pushing more air into the cylinder which could throw off your air/fuel mixture. The best way to do this is with some megasquirt injectors, tuning, high pressure fuel pump, etc. If you run high boost, you should just get a completely upgraded engine.
1999 Chevrolet Camaro SS (PC'd)
1994 Chevrolet Beretta Z26 Q4 (W41 M90'd)
2004 Chevrolet Silverado 2500 (4WD)
My wife's cars:
1971 Dodge Charger SE (stock and original 383 auto)
2004 Subaru Impreza WRX (kid-hauler)