The 68mm bore pistons shouldnt be any harder to get. I believe you run a long rod crank with blaster pistons for that setup. If you thinking about getting a long rod crank to run the 68mm bore you might as well get a +4mill crank, and 4 mill cub cylinder, unless you have specific reansons why you need to stay stock stroke.(drag class limitations). These banshee parts snow ball pretty easy. For just a little more I could go.... on and on, it doesnt ever stop.
josh