anyone balanced a stock 360 crank?

I own an automotiver machine shop that specializes in Chrysler performance work.
I have built a number of the 360 performance engines and although they are external balance they have all performed very well. A few have been copies of the Chrysler 360 crate motor with some extra enhancements in the valve work area. It is costly to convert to internal balance because of the expense of the mallory metal(tungsten). Balancing the crank as an external with an aftermarket damper or stock unit works out better than going internal due to the cost of the metal and the labor involved.The entire thing boils down to "attention to detail". When we balance we go to "0" for the right and left counter weight correction. Most shops stop at .5 grams which is commercially acceptable and for the most part will work OK. I just feel that I will balance someones motor the same way I would my own.