I didn't do that this time around, because I am replacing with the same* TC so figured a smooth swap. Originally, I did have to slightly egg out a couple of the holes for the after market "production variances". Having the flex plate bolted to the crank and the TC pilot hub engaged in the back of the crank is the only way I can think of (with my cardboard and PlayDoh) to ensure that both pieces are concentric before starting to massage bolt holes.
