mguner
How many is too many?
or go internally balanced and get a new balancer. (your converter should be good to go neutral balanced/just need a neutral balance flexplate)
Internally balanced is more than just the converter and Harmonic Balancer. You have to have the matching crankshaft (cast or forged). You can internally balance a cast crank 440 with Mallory metal etc... but it will destroy itself if you just swap parts around. Also which B&M flexplate? The one for internally balanced or the one with the cut out?