You'll probably need a lot more than a motor. My tale: when I first saw my 230SL, the motor was on a stand next to the car. The owner said the car was complete, and the motor rebuilt. He had the paperwork: used head and valve job done ($2K, he had purchased the car without a head, and he did rings, bearings, all clutch goodies, and flywheel resurface).
I purchased for the beauty of the thing, and the thoughts I would have a good car. While most of the internals of the engine were together, there was much to be done.
Here's some of the things I've had to work on: stretched timing chain, wrong intake manifold, wrong power steering pump, wrong injectors, incorrect head and IP (but these should work), missing exhaust parts, missing chrome pieces off one door, both door windows loose, door locks a mess, heater core loose, no windshield washer pump, bad motor mounts, bad steering shaft bushings, and more. I still haven't run the car after a year, and I have yet to deal with the brakes and fuel pump/gas tank (latter two replaced in '95 so maybe ok).
The good news, the car is relatively rust free. It's been hit once, minor in front, but new grille, bumper, and hood.
This site has been terrific for me, there's so much help here. I've restored two vehicles before, a 1959 Austin Healey Sprite, and a 1948 Dodge pickup. NOTHING compares to the complexities of this SL.
Plus, I'm getting old!
I hope I can finish the thing while my body can fold up to go inside. (I should be able to start it in a couple of weeks.)
My advice on suppliers, get to know your local M-B dealer parts folks. Beer helps mine along. There are vendors connected with this site who are also very helpful. For an idea of all the parts this car has, and how it is put together, it is hard to beat SLS:
http://www.sls-hh-shop.de/index.php/cat/c3_Mercedes-Benz-230SL-250SL-280SL-Pagoda--R113-W113-.htmlTheir service, from Germany is good, but with the Euro exchange rate, the prices are high.
Here's an engine for you:
http://www.adsitco.com/category.asp?CID=1871There's lots of goodies to hang on that thing before you turn the key.
I wonder how many parts were removed from your car when the engine was removed?
Good luck, and keep us in touch!
Ron