I think for a street engine it is more important that they weigh the same than be lighter. I don't know when you have to be concerned with the balance between the rods & pistons and the crank counter weights.
My idea is to follow as many of the good block prep and rotating assembly prep best practices as I can, tools and talent permitting. Not sure I will be able to call it balance and blueprinting but that's the bar; hopefully that effort nets a positive effect and I don't make too many detours!
