Carb guy here...

I understand that carbs can be sized pretty close using engine cubic inches and % of efficiency. That makes sense to me.

Is there a similar rule of thumb to size injectors?

How about an example of 383, profiler heads, 9.6 static comp, cam with 230 degrees at 50 on both intake and exhaust and .575 lift?
Then, how much larger injectors if blown with 6lbs boost later in engine life?

What happens if you put on much larger injectors than needed? Can the control use only the amount needed or is a squirt one size no matter what?

Thanks in advance for the teaching.