Non of these coils even with EI will improve the power output of the engine. What the flame thrower and EI will by you is to provide a good spark when the plugs have deteriorated and the gaps opens up. The EI frees you from replacing and adjusting points.
I am a big proponent of EI and I used to be a proponent of Pertronix EI but I had some reliability issues with the Pertronix unit on my TO-30 and I"ve gone back to conventional points. I think Pertronix has some QC issues with their module and the result is a lack of reliability (two failures within three months after 5 years of no problems) which to me is the only advantage of EI.