For decades automotive manufacturers have used batch firing for fuel injection, all 4 on one side then all 4 on the other side or 3 then 3 etc. The actual timing of the injector spray has little effect on overall performance.
True sequential fuel injection systems are much more complicted in design and cost.
Larger injectors, higher pressure fuel pumps, more sensors etc to deliver the required amount of fuel in milliseconds vs batch firing being able to cycle twice per combustion event.
Regarding your thoughts on the intake ports; even with no divider in the intake between two adjacent cylinders, the intake valves are not open at the same time on the adjacent cylinders so competition between them is measurable but negligible in most cases.
Timing of the injector spray is only relative to the fuel being there at the start of the intake stroke.
The ignition system decides when to fire the spark plug to ignite the mix approx 360 degree later.
If you want to try this just to say you did it then all the power to you, I enjoy reinventing the wheel on occasion myself. From a practical functional standpoint I think it would be too much work for too little gain.
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Today's Featured Article - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
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