Learning curve,new combination's......

In the y2k era: A buddy,had a 72 Dart Swinger. Mild combinations + mild N20 hits,got him to the low 12's(j y. stuff). He picked up ,an aggressive 340 solid roller engine. A new world ,for this guy. Always came in,with a loose rocker. After losing on the street,(more than a few times!). He started listening. He ended up,in the low 10's ,with a shitload of spray.