You can change the badge back to 250 SL if you'd like. A good 280 engine is at least as good as a 250 engine
The steering should feel relatively light (assuming there's power steering, must admit I'm not sure whether they all had it from the factory) especially with the original large-diameter wheel. Acceleration should be "surprisingly quick for such an old car" but probably most modern diesel delivery vans will be quicker at a traffic light. In all, it should be able to run with modern traffic and handle and brake nimbly. Try driving a few for comparison, there can be big differences between cars.