when load and rpm increase the ecu advances ignition
you could leave it static but it would run like a dog
you could go to a mechanical ignition system (dizzy) if you wanted . these have mechanical systems to advance ignition timing as load and rpm increases usually some sort of manifold pressure advance or wieght system adjusted by rpm
the whole thing is not realy worth it though theres a reason we abandonded carbs and distributors , they are old tech , unadaptable and inefficient .
an rb26 revs to 8500 with ease , how much more revvy do you need ? try and adapt the rb26 head to your n/a perhaps ?