Yeah Hoony, there are a couple of things that I can see.
The overhead oil feed is on the left side of the motor.
The ignition cover plate is alloy and hopefully has a W stamped into it.
The earlier ones had a plain chrome cover plate.
An all alloy finish. The earlier ones came with a black barrel. Some came with a black rocker cover
The year? seems about right.
And I've got one
And I hope I'm in the ball park
regards Mark