93 eg: Question heavy.

I recently bought a 93 eg and due to my short time frame I didn't have much time to shop around. As a result it has a few flaws: Rattling at around 3000 rpms. (Took it to a shop and the guy looked at it on the street and after some revving said it was the clutch)

Cluster doesn't light up and odometer doest change. (I changed fuses and replaced the bulbs but still nothing relay looks fine)

Passenger door doesn't close properly. (It was fine as far as I could tell until I took it to a shop to have the old alarm replaced now it rattles and has to be slammed to close properly)

Headlights are dim and the pattern is ugly looking and overall this makes night driving scetchy. (Guy claimed they are HID'S but they don't have the wiring HID'S need and are as bright as a rundown flashlight)

A/C doesn't blow cold but there doesn't seem to be a problem with it. (I think it may just need freon but don't want to waste money if I'm wrong)

Overhead light flickers and turns off when the car moves even a little.

Now to do my part in trying to learn more about my car I took a morning to look into what I have under the hood. What I found is that I have a b20b engine and a bunch of parts I can't identify. As well as a m3 cold air intake and what a pears to be an aftermarket exhaust system and a bunch of bad wiring jobs.

I like the car very much but want to do a all wheel drive conversion at some point and make around 300hp at some point. I could really use some help figuring out what I should expect cost wise. Along with any information I can get on the conversion as well as pointers for the power goal. I'm very new to the car scene so if anything is obvious to you it's probably not to me.