Hi Daniel, I got your email but didn't have time to reply so it's great you ended up posting here.

Gearbox is M20 not M22 so its a 4 speed manual
Engine is a 6cyl 202
Colour is Durham Beige

Is it a Sandman? No one can tell you unless you had a reputable person do a solid visual inspection of the car, there are some tell tale signs that wont be discussed here.
Do you have photos you could post up, or better email them to me at info@mysandman.com.au

Do you have sales or order documents from the dealer, because that could help too.

Cheers.