If you are using FCR Flat Slide carbs, here is an item that we found that greatly improves throttle response on race starts and restarts. It is a replacement accelerator pump cover and check valve from Stealth Technologies. You can find it at:
http://www.stealthracingtech.com/catalog.htm

It is easy to install and reasonably priced.

Lynn Grabill
lynngrabill@gm,ail.com
#2G Micro Sprint
Savannah, MO