340 Crankshaft balancing.
was just going to post that
If the block needs bored
stroker kit- lighter pistons, better rods and rod bolts, crank ready to go.
some weights to compare
743.4 (70) piston, no pin
721.5 (73) lighter if cleaned up, remove carbon,no pin
474.5 (2014) stroker, no pin (pin is .924 dia)