All things being equal, yes, a longer stroke will increase compression. I will modify the dish in the top of the piston to compensate. This will never be a kit. In any case it would not work with the stock piston because the stocker is too long below the wrist pin. With the stock piston you could only increase the stroke a couple of millimeters before the bottom of the piston hits the crankshaft. The 790 piston is a much more modern design and has the necessary clearance under the piston. As far as what is an advantage - It totally depends on what the goals are for the end result. Longer stroke makes more torque at the expense of rpms and vibration and depending on the motor can be more difficult or expensive than just a bigger bore.