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My GTX was a solid 12.3 car when i changed and went about a 10th faster after that maybe a tad more. had gear out and when car was 11.00 to 10.9 put it back in and it was again a good .10 to .15 better after the change.
Nice increase through first and second little bigger drop off to third gives some back
stock
2.45 1st and 1.45 second
low set
2.74 1st 1.55 second.

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A little looser converter probably would have helped "giving some back" in third - wouldn't have let the RPM drop quite as much. Shifting at 6800 there is about 300 RPM difference in RPM drop - from 4400 to 4700 - between the 2 gear sets. A converter stalling over 4800 -5000 (or higher) probably wouldn't give anything back, and if it just a slight increase from the old one could be just as efficient on the top end.