I'm guessing the engine is slightly overcammed- the cam/rocker combo has the ability to rev to close to 7,000 rpm, but the heads are the big question mark here. The heads would have to have been ported by someone who truly knows what they are doing for this engine to make power any where close to 6500-7,000 rpm if valve sizes are only 40x35 mm. If valve sizes are 42 (or 44) x37 then there's more of a chance the engine will come close to it's potential, but the single valve springs won't let it rev nearly that high either. The ad also doesn't say how big the carbs and exhaust are, or what the compression is set at, so lots of unknowns.
Generally, overcamming an engine creates a powerplant that does nothing really well- the long duration means it doesn't make all the bottom end torque it should, while the mis-matched other stuff will cut the rpm's (1,000? 1500?) short of the cam's potential. Essentially you end up with a rather narrow poweband. Now, being a 2276, the larger displacement will hide a lot of this, but it just won't be all it could be. A cam swap (from the W125 to a W120 or even W110) may be just what this engine needs if you're looking for a true go anywhere, any time driver.
At the very least, you need to find out from the seller exactly what all the components are before making an informed decision.
Hope this helps. Al
