[LNorton]

Greg, I dont know the exact difference from C-12 to Purple, but I would play with jetting and timing first. I know with our car going from 93 Pump to C-10(unleaded), I had to make a conisderable fuel and timing change to get it to run the same. 93 being the quicker of the two in the end. Stupid 93 will give us problems at nationals though.