Frank,

What are the specs of this engine?
total CC, bore and stroke?
Are you sure you can run this baby that high? 12000RPM for a v....kind of high.Is this a race type engine?
If your stroke is less then bore....may be able but still ...
Race engines uses high bore and short stroke and develop the HP trough high RPM's do to less inertia, engine can jump quick on RPM's...for fast acceleration...Formula 1, Indy etc.
If your stroke is higher then the bore...do not even think about, they will go up 4500-5000 RPM's and will have a good tork on mid range.
I am ... cooking a V12 engine(merlin engine for more than a year now) and this will not go more that 4.500 RPM's (19mm bore-21.1 stroke)
Ignition and fuel injection will be a real chalange. I am good at mechanics but I s...@ electronics. I have Ideas but I can not make them .

Concerning if will be enough energy for 2 sparks with one coil...YES, it will work, it has been done,I seen it working.

Rob,Guys, I have an Idea for a fuel injection,I will throw it out...Based on the same CDI timing board idea; On the camshaft one sensor to know when #1 is, then based on RPM's to calculate the equal timing for the rest and the mini injectors just to pulse,open and close. Then to have a TPS(throttle position sensor)to know where throttle is. When Throttle opens to increase the fuel pump ...output and put more fuel out trough injectors.I
pump can be electrical and increase the RPM on this , or mechanical with high pressure/volume and for this to open/close a valve . Couple sensors may be need it, fuel preesure and intake presure, nice will be to monitor the temp of the exhoust. Just an Idea...can this be done?

Adrian