Torque converter weight conundrum!

Myself, and I think we've already discussed this, but I would have your flex plate balanced.
I've just found that, down the road, if you EVER want to throw a 318 magnum in there, or some other swap, you'll not have to mess with the converter. Just pull the 360, and drop the next in. On my 360 Duster, I had the flex plate balanced. I don't include the torque converter on motor swaps. (I did, however, buy a new 360 converter with the tranny rebuild on the ramcharger, but that is not how I normally do it)