When I freshened the engine, and basically the whole car throughout 2007, the only internal changes I made was a 252/256 572/579 Hughes cam in place of the old 296-557 purple shaft. The 9 inch picked up 4.30s in place of the old 4.88s, and the 904 picked up a Griner Pro Brake. In 2008, I was still racing the Challenger, and ended up with a variety of people behind the wheel of the Valiant. 5 people made passes and it recorded a best of 10.70-123, my best (I'm larger by double) was a 10.89-121.