Forward rake & wheel recommendations

[Spille85]

Hi everyone, I'm a proud recipient of my fathers 1967 3/4 ton truck. I know its not in the best of shape, but I'm hoping for some advice. I know the tires on the rear are much larger, but as long as I can always remember this truck has always had a rake to it. Is this truck suppose to have a rake and if so, what can I do to level it out. Finally, I'm having a tough time finding 8 lug wheels for this truck. Any recommendations on what brand wheels and tire size I should go with. My goal is to obtain a level stance with pretty much the stock tire size or maybe a little larger. Thank you