[frankym]

thanks for the helpful suggestions. I need to retard the total advance a few degrees at a time and test. Since this is the first time I've experienced hard starting when hot, I don't know how advanced I was after all. The claim from my mechanic was that it was set at 55 degrees and is now at 39. I will turn the housing counterclockwise a degree or 2 and then drive it and see if I can rid the pinging sound. I have a duraspark ignition system and the standard FMS crate package with iron heads, not sure if the distributor is vacuum advanced or otherwise but this is all very helpful. I am also running 93 octane with the 104 boost bottle. With all of your help, I think I can adjust the timing in small increments and rid the world of the ping.

Frank