GREAT NEWS....and bad news...

when using points,the ballist resistor is in line,,when you use a MSD box,you eliminate the ballist resistor. the MSD requires 12 volts constantly, when using points the ballist cuts the voltage to 6 volts i belive when the car starts,,

a i am pretty sure the MSD has nothing to do with you blowing the fuseable link,, you either have a short,,or a dirty/weak conection . what year is the car ?? what charging system ?? single or dual field altenator ? pre 70 voltage regulator ?? blue regulator from mopar ??

sounds like a weak or dirt conection,