The pickup coil is located in the right side engine cover where the alternator lives. The 270 degree engine has 2 lugs on the alternator rotor to cause a spark. Both cylinders spark together, but just one is in the correct position and loaded with a fresh compressed charge, so it is the one that actually fires.
The 360 degree engine had just one timing lug. This means that it can (and does) rev much higher than the 270 degree version when the rev limiter is modified or disabled. Because it fires twice as often, the stock ignition system on the 270 engines is only good to around 8200 - 8400 RPM while the 360 with the same coils and wiring will wind up untill the engine disassembles itself.
It should be possible for someone with the proper equipment to build up the second timing lug and machine away the original part so that 2 pickups could be used. This would mean buying a second ignitor and wiring one coil to each system. Except for Joji in (I think) Sweden, the internal workings of the igniter are pretty much of a mystery. Depending on the output circuit design, it may be necessary to add a dummy load in place of the second coil to keep things working right.
