I think that the pertronix and the davis are both great.

But the davis wins with me due to it's one wire hookup, it's coming calibrated per the specs you give when you order, no coil wire, no box, and no BS in a nutshell.

One of the things I have always hated about mopars is their junk ignitions. Davis straightened that out nicely.

The pertronix with ignitor 3 module is the one to get IMO if you go that route. I think it's the same price too as the earlier units.