my 292 engine is coming along nicely, I purchased rebuild book by Charles morris and am following step by step instructions, the block was bored .40 over and crank grind was .20, when I took engine apart for the rebuild I put all parts in bagies and labeled them, I noticed the instructions have a counterweight that needs installed but I don't have one, the engine was rebuilt before, is it possible they left it out, is this not possible and I misplaced it somehow, any help is greatly appreciated