Best Alternator to give sufficient juice to the MSD 6AL ?

Could also go with the factory Mopar 100a as used from the mid 70s on. Those did have different brackets though.
They were rated higher right off of idle than the smaller Mopar alternators. But again if the system is only calling for 17 amps even a newer car's 180 amp alternator will only produce 17a.... They don't have full output unless demand is there