The original was an awesome car. To build a replica with a V8 strikes me as a bit of a heresy. I'd rather it have a hotted-up straight-6 from one of Mercedes more recent machines. Anyhow, long ago James from Top-Gear did a good piece on the car.
Here's a curious factoid: The street version of the 300SL actually had a hotter engine and wilder cam then the original race version did. That's progress!