Pulling timing in high gear or adding timing in high gear has been a debate for many, many years. The answer is "do what the car wants".
There is some good theory behind both and it has to do with the fuel curve of the carb. Adding or pulling timing is often a crutch to fix a fuel curve issue. EFI engines might not need timing correction going down the track. And what works on the dyno might not work at the track. They dyno loading is a lot different than the load that the engine sees in the car going thru the gears. So the timing curve that picks up power on the dyno might not be the best at the track.