You can choose either a internally balanced rotating assembly
Eagle Specialty Products B13470030 - Eagle Street Performance Rotating Assemblies - Overview - SummitRacing.com or a externally balanced rotating assembly which includes main & rod bearings and a balancer and flexplte.
Eagle Specialty Products B13460030 - Eagle Street Performance Rotating Assemblies - Overview - SummitRacing.com Have the block cleaned, bored .030, new cam bearings, freeze plugs, and screw-in oil gallery plugs you have abrand new short block. You then what heads to use. New or rebuilt.