Engine sounds slush GZE with VIDEO !

[Okami]

Hello everybody,

I am having some questions, some of you die-hard knowledge people might know about.

I have a 4agze in my AE86 since a few months now. (1st gen aw11 145bhp).
I have been drifting with it and it is an absolute pleasure.

Since I have almost everything finished towards the engine I am stuck with some questions my friends asked me.

1. I have a stock 4age fuel-pump and injectors on my 4agze.
How much can they handle?
When should I upgrade and do you have some brands for me and links I can use to purchase these when I have the money. Thank you.

2. I have a new crank-pulley that gives me 20hp more power and want to install that.

3. Some days ago I went to a shop to install the lambda on my exhaust manifold and we de-installed the sparkplug timer.
My problem now is that my car runs too low in the rpm's. (I think).
I sometimes have the feeling its a little too low. Like it almost wants to stop! So I think It can be better when its a little higher.

How can I fix it and can somebody give me tips and tricks and extra points to watch.

Also- How can I adjust the spark-plug timer to the best set-up.
How can I see how it was like factory setting.
And should I be aware with the other Diameter crank-pulley I want to install.

Top left - that silver thing has a electrical plug on it and a friend of mine said that it was for the timing of the sparkplugs.
It has a ring on the left side where you can time it with but we de-installed the whole thing.
Inside there's a shaft with pointy things on it and now I dont know how it should be - what the correct setting is.

Please help! Thanks!