As anyone used this ?

I'm looking at converting my 73 Dart so mine starts and runs better.
click, vroom-vroom
that's the sound of my 11/1 compression 367HO coming to life on fresh or stabilized 87E10, with a 750DP on a hi-rise aluminum dual-plane intake. That Dakota mini starter is something else.
E10 is nothing to be afraid of.
87E10 is probably the fastest burning automotive gasoline we have ever had, since the beginning of time. Which is why I designed my engine to burn it.

IMO, before you start spending money, it would be a good idea to check the health of your engine. I would start with a compression test and followed by an LD test, with the pistons at the top.
If your engine is tired, converting it to EFI, IMO, is not the answer to your problem.