Will this work and look good?

[xfsketch]

Im still trying to figure out just how big pf wheel and tire combo i can run on my 72 lwb chevy. Its in stock stance. I want the rear lowered to make the truck look level and then put some 20x8.5 rims pn the front with 255/35r20 tires. On the back some 20x10 with some 265/35r20s. Will i have any problems bolting these up and steering or driving it? I would have to get 3 inch drop springs for the rear? Im ok with chopping my wheel wells. Also will the tires look good the sizes i mentioned? Please help im planning on dropping 3000 in this truck. Really want to just order the right thing the first time. All help is appreciated.