Hi folks.. Been a while since I've been on, but finally got my 77 450SL up, running, and registered.

2 Questions:

1. I seem to be having problems getting the idle speed right. Worse yet the book I have does not describe adjusting idle speed very well. Right now I have the idle speed at 700 in gear, but when it's in park it shoots up to 1500 - 2000. That doesn't seem quite right. Any ideas? I'm not sure I'm adjusting the right thing.

2. Does any one know of a good place for replacement interior parts? Now that it's running I'm up to fixing her up

Thanks! Can't wait to go farther then the local store ...heheh

The idle adjustment screw is located just in front of the air cleaner, slightly off from center to the driver's side of the car. It's a screw that uses a flat blade srewdriver, probably 3/4" in diameter. Clockwise slows the engine down and visa-versa. That engine should idle 800rpm out of gear, 550-600 in gear. That engine has an additional air valve (located next to the idle screw) that is used for fast idle when the engine is cold. You may have a stuck additional air valve.
Congrats! on getting "her" up and running.

Well At least I had the right adjustment. I'll check the air valve and see if I can't get adjusted right.

Only have to fix a small exaust leak and then see if I can't get it to pass the CA Smog inspection.

Not bad since I got the car for the price of a new engine and transmission (which I got really cheap from a guy that rolled his)!