Thanks for all the help. I was 70% sure the body was the same. Just needed confirmation.
As for the engine it is a 429 with a 4 speed manual box. ( Don't know what type of box)
I am in the process of stripping the truck. So far the cab seems to be in good condition, very slight rust.
From what we found so far we will need a master cylinder rebuild kit, all the rubber moulding & weather stripping, wind screen, hood and lowering i-beams.

I can't seem to find any info on a dually bed. I did see one picture online of a truck like mine with a dually bed but think he had it custom made or converted his rear to a dually.

Thanks for all the help