That's good for a driver for sure what is your reason for wanting to change your trans .
for me if i was going to drive it on the street and wanted to make it stronger i would go with the turbo 400 and for racing the glide is not going to help you really because of the weight of the car.
The reason i say that is because i did that a few years ago went from a turbo 400 to a glide and didn't help as far as ET goes it was in a nova at 3500 lbs the 60 foot slowed down and the ET also the only real advantage for me was going to air or electric shift the shifters are cheaper .
So it all depends on what you are trying to accomplish.