You need the performance engine book , MoparAl may be able to scan the page you need , I have the same book but not here with me , the engine balance was different between every external balance engine the 340 , 360 , 400 , 440 cast & 440 6 pack were all different weight offsets so the flywheel cannot be swapped between them , the best route is either to balance everything as the engine is assembled or have the engine internally balanced as it si built . My Race 440 used 6 pack rods but there were severely lightened & polished & the crank was weighted so everything was balanced properly internally . Using a new flywheel drilled correctly will get you close as long as you do have the 6 pack rods & correct pistons in the engine now , if you have a lighter piston which I would recommend then it will still be off .
I am not trying to depress you but it is better to find out now than once it is all together & vibrating .
