The Pertronix Flame-Thrower coil? No, you don't need a ballast resistor. Uhhh, you don't happen to have your coil mounted horizontally do you? (Meaning not having it straight up and down).
Why I asked -- If you have it mounted sideways, make sure it's the epoxy and not
oil filled.
http://www.pertronix.com/prod/ig/fla...s/default.aspx