Blaster strokers come in 3mm or 4mm most people go with the vitos 3mm. Your going to need to split the cases and install the stroker crank. Then you are going to have to cut your top end to fit the extra stroke. You have to have a engine builder of machine shop do this for you. Vitos sells a spacer plate but I would not use it. While you have the bottom apart you should replace the bearings, seals and gaskets along with making sure all of the other bottom end components are in good working order.
To have Wildcard, Flotek or Kennedy do the work it will be between $3-$400.