1976 Mercedes-Benz 450 SL for Repair or Parts. "Please read description"

1976 Mercedes-Benz SL-Class 450 SL

I'm selling my 1976 Mercedes 450 SL for Parts or Repair, the odometer on the car shows less than 63,000 miles but I can't confirm that it is the real mileage. The car starts but will not staying running and doesn't seem to change gear while moving.
The 450SL should have a 4.5l V8 with the engine number 117.985, instead MINE HAS A 6.9L V8 WITH THE ENGINE NUMBER 100.985
The car has a crack on the windshield, and on the dashboard.
The body has some spot rust, see pictures
The interior needs upholstery.
Please, contact me if you need more information.
Thank you,

• Condition: Used
• Make: Mercedes-Benz
• Model: SL-Class
• Type: Convertible
• Trim: 450 SL
• Year: 1976
• Mileage: 63,000
• VIN: 107 044 12 028396
• Color: Grey Blue
• Engine size: V8
• Number of cylinders: 8
• Power options: Cruise Control
• Fuel: Gasoline
• Transmission: Automatic
• Drive type: RWD
• Interior color: Blue
• Options: Convertible
• Vehicle Title: Clear
Want to buy? Contact seller!