Dusterboy, What background do you have in engines? The reason I ask is there is much more than ordering new pistons or turning a crank and just sticking it together. That is a recipe for spending money many more times than you have to. I'm assuming you dont have the unlimited budget. What do you want out of your car? How much money do you honestly have to play with? What have you already done to the car?
In order to swap strokes, you also need to replace pistons and rebalance the assembly. In order to replace pistons, you need to rebore the block, and re-hone, and rebalance. You will also need new rod and main bearings, and now ring, plus cam bearings and block hardware, plus completely disasemble the engine. Basically, a rebuild. The compression is a big part of power, but you cna make power in other ways without spending on a rebuild. SO what do you really want to do?