I have used Pertronix units but I have never used a Langdon's Stovebolt mini HEI. I have had good service from the Pertronix unit (about 10 years for one and about 5 years for the other).

If you are referring to a 2-barrel from Landon's Stovebolt, give him a call and discuss it with him.

Maybe people will post personal experiences with the mini-HEI and a 2-barrel carb.