Hi, I found a r129 300sl-24v (1992 model) equiped with 3199cc engine for sale but not sure whether this engine is factory fitted or been replaced. The engine number in registration card is 104981xxxxx and chasis no 1290612xxxxx. Google around found that 300sl-24v is equiped with 2960cc and not the 3199cc engine. Please share your view. Thank you.