Since you have so much invested in this engine combo. I think you will want to call year one and edelbrock. Since you will surely want them to warranty the engine if any issues come up. Best to get them involved eary. They probably have some good techs that can help get things worked out. Msd is also good on the phone they will run over all the needs for voltage and grounding and make sure your all set.
Like fbird said be sure the engine and msd box is properly grounded. I would check all the gorunds for loose or dirty connection. Make sure paint is not causeing the ground to fail under a load.