I am putting together a 408 stroker and have started to think about the ignition system. The stock duraspark has done a good job for me so far with just a hotter coil and getting my advance curve right. I would like input from some of you all that know. Is the MSD 6A or Digital box and distributor worth the change or is the Duraspark up to the job. I am not planning to put nitrous on this motor.