Hi Willy,just another thought.....How are you going to convert the dash??
I do know the AD series trucks were built in RHD,maybe you could track one down,there is a South African built AD over(up?) here with factory RHD.
So they are out there.

A Schnapps company was using it as a promo vehicle,but unfortunately it is too good to cut up! eek

They never actually sold AD's here in 'Blighty' or else I would happily help you find one!

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.