Evolution version 2 is an improvement insofar that it can detect sense of rotation, runs on unregulated lipo cells, and can have added choke servo and ignition timing features. Furthermore, when the engine runs backward, the ignition just stops until it is reset.
If in version 1 the engine will not run right because of ignition issues, that is a warranty question and should be addressed as such. There will be no power difference between the two versions. So far, I have seen no reason to convert my engines under test to the new ignitions. The Vlach items served me quite well so far.
The very first MVVS engine with graphite plated piston had the same power on the same carb as the current engines. Nothing has been changed in engine construction and/or timing. As technology became available, ignitions were updated as well.
The new ignitions come in three flavors. The manual(s) can be downloaded from my website.