Thanks for the replies guys,
I am still learning about this truck myself as I cannot claim responsability for its mods and resto so I can't tell you too much.
I beleive it to be around a 4/6" drop with drop spindles up front and some big blocks at rear but as I haven't actualy seen what the stock set-up looks like so it is hard for me to be sure.
Wheels are 17" TT 2's and I will check the rubber size and backspace soon.
Tires do scrub a touch but only in severe cases of bottoming out.
It handles pretty good considering it doesn't even have a front sway bar.
Thanks again for the replies, Mark.