Mopar Performance Of 1999 is not Mopar Performance Of 2021
Apples to Oranges or USA to China
Honestly does Mopar Performance even exist today with respect to our older cars ?
Same can be said of Pertronix. A 20 year old Pertronix kit is not what they are selling today.
Since the OP neglects to mention what he's putting it on one can only surmise about a good replacement.
But Rockauto has Standard Motors conversion for the /6, LA. B. RB and Hemi listed. LX812 for the slants and LX813 for everything else.