D24 performance summary + water injection possibility

[Echo1975]

I just rebuilt the head on my NA D24 and I have gotten good results with it after adjusting the pump right.

I currently have:

Increased fueling a lot. Homemade made tubular headers with 3" downpipe going to a 2" exhaust. Intake manifold casting marks have been sanded down.

I ported the cylinder head. Injection pump timing is currently 0.90mm. I have the stock resonator as the only muffler right now.
I cleaned the injectors with a ultrasonic cleaner.
I matched the exhaust and intake manifold ports to the head the best I could.

The bad:
Fueling too high
Exhaust too small? (2")
Worn engine
Worn injectors
Air box intake pipe not working as a cold air intake
Engine breather hose still connected to intake manifold

I wonder if removing the breather hose from the intake and plugging the hole on the intake and adding a bottle for the breather would increase performance because this engine currently has enough blowby to blow white smoke out of the breather hose if you remove it while the engine runs.

Piston rings don't seem too expensive but don't know if they would do anything if I only put new rings on the pistons? The blowby doesn't show as oil consumption at all.

I currently have so much smoke that there is a huge black smoke cloud if you floor it. I think the next step would be to back off the screw quite a bit because I am afraid to hold the throttle pinned for too long because I fear the engine might get damaged from the most likely high EGTs.

I don't have an EGT gauge and I wonder, how high could the EGTs get with a naturally aspirated engine that is being overfueled? Could the temps actually get high enough to melt the pistons?

I have also realized that the engine is advertised as having max power at 4800 rpm but the rpms climb so slow after 4000 rpm that shifting at about 4200 rpm is a must.
I looked at the governor mod and think I can do it but will this help with a naturally aspirated engine? Would it be able to pull well to over 4500 rpm with the mod and would it cause EGT issues?

I am looking at the possibility of installing water injection to the engine as I've heard this would lower EGT and increase oxygen making it so you can burn more fuel?

I have the setup well understood except I wonder if you have to use alcohol with the water or can you just use water and have performance gain with it?

I have the idea of using a button under the throttle that when throttle is pinned it starts injecting a cloud of water through a nozzle of some sort through where the breather hose currently connects to the intake manifold.

I currently got 0-100 in 16 seconds with the car and believe it can be improved quite a bit.

Currently I got very good low end torque. So much so that the car is pretty much impossible to stall even though 1 gear is rarely used on this car.

My final goal would be under 15 seconds 0-100 naturally aspirated with very little smoke full throttle