[Trans-Am Jim]

Big Mike:

When backing into the garage, I usually just let the car idle for 20-30 seconds then turn off the ignition. With the 11 degree advance, I got some dieseling. Knocking it back to 9 sort of solved it. 'Course that only works if ya got your carb idle circuit set correctly.

I think sometimes ya have to make tradeoffs between power and driveability. On the street, top end HP is meaningless to me. Others feel differently and have to have the motor on the sharp edge all the time.