Yep, the MAF engine I have in my '65 has much faster and more crisp throttle response than the SD engine I have in my '88 GT. What's up with that? Something wrong with the '88 or would my mods on the '65 help my throttle response? It's response is as close to instant as could be. The '88 has a little sputtery type of action when you blip the throttle on it.