rebuilding 1981 380 sl, plenty of questions

[FloodKid]

Im working on rebuilding a 1981 380 sl that was flooded during kitrina. She runs prettty good, getting some new sparkplugs and checking out some other stuff to get the engine running better. It feels like its not running all four cylenders if anyone has any other ideas.

I really wanted to know if there was anything that I should change that would make the car more comforable or easier to drive. Like the gauges and speedometer i plan on getting new ones. And the aircondition switches im going to put in the new model set up so its still classic mercedes, but doesnt look as cheap. If theres anything that anyone has seen or thought might look good on an SL, or classic mercedes, or just in general. plz let me know, any feed back would help.

I also wanted to know if anyone knows what it means when the exhaust is blowing out black smoke. Ive run the engine a little bit, so it doesnt push out that much, but it still blows some.
And i need to know if theres a trick to draining the oil out. or should i not worry about the plug and just pull down the whole pan.

If anyone knows of filters they would recomend, as in different sizes that would work better. Or even some ideas they think would help the engine, plz let me know. Such as a certain type of spark plug? or fuel filters that they have found to work best. or certain wire upgrades.
I also need to find a picture of the frame after the recall. Supposivly the body of some SL's werent as sturdy as they should have been, so when I reweld the body i wana make sure this is covered.
And would it be better to put a turbo? supercharger? NOS... hehe... or just leave it as is. yea joking about NOS. or just upgrade certain hoses and gauges.

Im not planning on keeping this car original, like most other cars are. I want it to be the body of an '81 with the comfort and user friendliness of new age cars. Although there are many things that I LOVE about the older cars and would never change. Like i said before, any feedback would be great, even if its just ideas.

I know its alot of stuff, but like i said. the car was flooded, so it all has to be redone or at least cleaned up really good. If theres anything else other owners think of plz let me know.