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Crane makes a nice roller cam with 218/222 duration & 488/509 lift (with 1.5:1 rockers) on a 112 LSA. $250 from Summit, sorry don't have the part # handy.
218/222 hydraulic roller with a set of 1.52 Roller rockers and replace your valve springs while you are at it. Also full length headers and The Corsa cat back for the LT1 fitted up to your headers. Would add like 60-80hp, a real kick in the pants...