When building a stroker motor it is usually best to purchase a rotating assembly. One first things to do is checkout your heads,(post your casting numbers)to know your combustion chamber size. Knowing the chamber size you can purchase your pistons for the compression ratio you want. Make sure the valves are at least 2.19 intake and 1.88 exhaust. You will not use your old pistons because the compression height is different on a stroker motor. Purchasing a rotating assembly is cost effective too. Here is an assembly from Summit Racing. Eagle Specialty Products B18021030 - Eagle Street and Strip Rotating Assemblies - Overview - SummitRacing.com
. You will need to find a machine shop to do your block and head work. If you need help choosing a camshaft or any problems that come up you can discuss it with your machinist. It's a good idea to know if this motor is going to be a daily driver or a street/strip motor or strictly race. Know what kind of vehicle it is to be used in.