You can, but it will be expensive. You will need a special cam with a reduced base circle, special length pushrods, and a roller cam retrofit kit. Check out either Comp cams or Crane Cams, both of them sell Hydrualic Roller retrofit cams. There are others too, just can't think of them right now.
Also, you will need to upgrade the springs, locks, and retainers in your heads.
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