RE: Falkon Ign. & M1 (A123) cells Unregulated
Take a look at your ignition box and it should tell you what voltage you can run.
I have Falken ignitions that stipulate 4.8 - 6.0 volts. I don't know if Falken ever made ignitions that would handle more than that but my more recent ignitions are ZDZ branded and will handle up to 9.0 volts. These are not Falken.
If you're not sure then regulate down to 6.0.
Mike would be able to give you a definitive answer but if you go with what it says on the ignition box you'll be safe.
Dave