I'm running the eBay distributor with a Flame Thrower II coil and I like it. Mileage went up about 2 mpg over the Chrysler electronic ignition installed by the previous owner. I got rid of the ballast resistor, the orange box and some underhood wiring.
BUT, I had one failure of the module which I believe was caused by misalignment of the locating pins which prevented the chip from making a good thermal contact with the heat sink. Skip White (eBay seller) sent me a new chip. I shaved off the locating pins with a razor blade and installed the chip with some PC thermal paste and it's been running fine since. If you buy one, check to make sure the chip is tight against the heat sink before you run it.
I have no idea if the curve is right for my engine, but it runs nice and gas mileage did improve.