stroker engine balancing

Looking to do a forged crank,internal balance engine.SFI balancer and 10.5" steel flywheel(these parts are neutral balance).Rods would be H beams in std. length.What weight piston would be needed to keep it internally balanced w/o adding weights to the crank?Would each manufactor be different(Eagle,Ohio Crank,Scat...?).Thanks,Bob