stock comp. 318, which purple shaft is best?

i got the MSD blaster coil its great but then again its just a coil,im gonna get me one of them MSD boxes soon to finish off my igni.i cleaned up my dist that hawaii sent me! :thumleft: i just need a box but im gonna run my points to get her running and driveing cuz they hav all new points and got it back from a rebuild,it worked once its gonna hav to work for a little longer :shaking: