nice job polishing the rods, now take them out and have them shot peened to increase the strength further. stonecold, polishing the rods is a good idea even on a street engine, though not required. anything you can do to eliminate stress risers is good.
as for balancing, you dont need a fancy tool for that, just some common sense. you need a way to weight the big ends, and the small ends, as well as the whole rod. a small digital scale that measures weight in grams will do nicely. you also need something to support the end you are not weighing so you can get an accurate end weight. start with weighing each rod and find the lightest one, that will be your standard. then weigh each big end, then each small end, again the lightest one will be the standard. normally the lightest rod will also be lightest at both ends, but there are the occasional exception. then grind the weight pads at each end of the rod until each rod weighs the same plus or minus 5 grams or less, meaning all big ends, all small ends, and total rod weight, as the rest of the rods. now you have a balanced set of rods. pistons are even easier to balance. weight each one and make them all the same weight by taking a small amount of material from the bottom of the pin boss.
once you have done this, you need to take the rods, pistons, a bearing shell, a ring set, the balancer and flywheel/flexplate you are going to use and have the crank balanced. remember that you changed the weight of the rods and pistons, so the balance of the crank is going to be off a bit.