A few thoughts....
1. The use of the phrase,
...such as..., seems to leave it open for anything they deem too modern to be illegal. So what else is illegal, belt drives?
newer technologies, such as EFI, electronic reactive ignition systems, are not in keeping with the spirit of the Vintage Classes and are not allowed.
2. I still don't understand the what "reactive" ignition is...
And 3. I like the idea of adapting modern tech to old tech...I think it's fun, but I guess not everyone else does.
The idea of an electronic fuel injected, computor controled high output ignition, belt driven primary, flat head single....is just cool to me
Still lookin' for a good answer to number 2.
Later,
Bob T.