What to do first?

Id go with factory style suspension and steering just with new bushings ball joints tie rods etc etc. you can convert the front to disc for pretty cheap and id look into the SSBC drilled and slotted rotors, factory single piston calipers will be fine, id either run manual brakes or vacuum assisted brakes, not downing the hydroboost guys but if you loose power steering you loose the booster. I believe you just have to swap upper or lower (cant remember) control arms from like a 79 volare. Theres a range of vehicles that will work thats just the only one I remember