* This post is to address the 82 380SL hesitation on acceleration. I'm assuming that once you get underway, it runs ok. There's a vacuum delay valve, pn 000 078 08 56, in the vacuum supply to one chamber of the control pressure regulator (K-Jetronic). If, using an engine with good acceleration, you replace that vacuum delay valve with straight hose, you'll get a flat spot on every acceleration. Of course you can watch this on a fuel pressure gauge. The control pressure should drop a little (see specs) when you open the throttle. This control pressure change does the same job as an accelerator pump in a carbureted engine.
* If you've got chain noise, it will probably be the worst after an oil and filter change. You certainly need to deal with that, but it's not responsible for your hesitation.

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Mercedes Svc. & Restoration
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