External Balanced 360 With new parts still Balanced??

What kind of times you run with that combo? I have a weighted or counterweighted flexplate for when I can change converters. I got it on here for a song so I had to pick it up. It a couple years when all the big money stuff is done and its running and driving and I want a little more I plan on upgrading the stock converter

75 Duster...3000 lbs with driver....has run 11.19 @ 118.56 in Las Vegas...