do you have a hydraulic flat tappet or hydraulic roller block?
if it is flat tappet i would look at a comp cams extreme energy 268 or 274, if it is a roller i would suggest a stock LT1 or LT4 cam.
either way i would suggest throwing on new springs jsut to be safe. the comp cams can be ordered as a complete kit with everything you need to install the cam the right way.
good luck with it.
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