35s w/ 4 inch

hello, just joined forums. i recently bought a running 1984 k10 scottsdale with a 350/T350/208 seutup that works. I currently have the front clip removed, the cab is stripped down to the dash and rusted over floor, the bed is removed and the frame was just de rusted and now is in primer. I bought it with new rocker panels, inner and outer fenders and wheel wells new cab corners and a new box. I was planning on doing a 4 inch suspension lift and 35s, but ive heard they wont fit or need some modifying will be needed for fitment and steering ability, any help with that would be appreciated, I was wondering about how to setup the brake system with the lift. I also was looking for like a walkthrough for the cab floor pan, rockers, and cab corner replacement. Anything that you guys could suggest or explain would be much appreciated, thanks.