Is a 72 340 and a 360 balance the same?

A good convertor shop should be able to balance to the '73 specs. And if I'm not mistaken, there were balance diagrams floating around on how to weight a neutral convertor to the external 340 specs, as well as the 360 and 5.9 variations. Once you find the weight size and location, you just braze it on. MP offered a kit at one time.