[ItBites]

Jack21 has the first right answer of the bunch. You cannot change to a stroker crank without getting new pistons. Think about it, the pin has to move closer to the top of the piston or the piston goes above the deck at TDC...

When you get the crank, just order the pistons you want. Make sure you carefully calculate the CR based on piston dish volume, deck height, gasket thickness, actual bore diameter, actual stroke, and head chamber volume to get it right.

Hound dog above has sound advice not to just go with what is being advertised. This is especially important in a blown application.

Good luck.