Spark-Lever Posistion

[rfitzpatrick]

Often read from new/old members stating their spark-lever location when they out on the road. Some do say 'full-advance' and was wondering at what speeds would that be? How often is full-advance used?

I have a '31 Pickup with a 3.78, everything stock and it's all city driving -- there's no Country-Roads any more (South Florida). I drive at no more than 50% advanced. What conditions would render the need for full-advanced?
Thanks