I noticed some quicker throttle response after my TB spacer. I look at it as part of an overall power enhancement package, and not just the felt gain of one mod.
I suggest a throttle body spacer, and take a grinder to the bore of the throttle body where it necks down under the throttle plate, make it a smooth diameter from top to bottom. Make sure the intake opening is as large as the TB spacer and TB.
Throttle body spacer
A throttle body spacer is designed to improve the quality of the airflow, allowing air that is more condensed and, thus, more oxygen laden, to enter the combustion chamber. The result of this is a more efficient burn, which serves to release more energy from the fuel, making more horsepower available.