For any discussion not specifically related to your project
What configuration are you planning to run it in?

The mega-based arduinos is gonna be a stretch om available outputs - UNLESS it has a single distributor. Then it will be possible with small code change.

Else, look for teensy or stm based speeduino, you need a 6 cylinder sequential capable one, then you can run your v12 in wasted spark and injection mode
TBI injector resistors

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