Assuming you have an ecotec or an L67 engine, then the parts that would be suitable are shown in the links below,
Valve Springs http://www.maceengineering.com.au/epages/shop.sf/en_AU?ObjectID=1469582
Please note that these require retainers to suit as shown in the link below http://www.maceengineering.com.au/epages/shop.sf/en_AU?ObjectID=1469377
Camshafts to suit turbo application http://www.maceengineering.com.au/epages/shop.sf/en_AU/?ObjectPath=/Shops/mace/Products/CAM609/SubProducts/CAM609
Please note that either the Stage 2 or Stage 3 cam would require valve stem seals to suit, due to the additional clearance they give between the retainer.
These seals are available in the link below http://www.maceengineering.com.au/epages/shop.sf/en_AU?ObjectID=1469378
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