Global West makes a Stage 2 now too?
If you meant a Street Comp Stage 2 your suspension and steering geometry are well covered. It`s going to yield a BIG improvement in both handling and drivability. It lays a really good foundation for any other mods you may make.
Nice choice of wheels. I always liked those. 245-50-16 in front and 255-50-16 out back would be a nice combo for a little more modern look without killing the classic muscle car feel.
Your front brake choice is okay but something with a more modern 2 piston aluminum caliper would be even better. Baer Serious Streets come to mind,smaller dia. but thicker rotors and much more efficient calipers. Skip the drop spindles. They cause clearance issues with the outter tie rod ends and they`ll prevent you from running much back spacing. Worse of all if you get your drop from the spindles you won`t get the geometry gains or additional spring rate you would with a good set of performance drop springs.
Personally I`d skip the bigger rear drums in favor of better front discs or a rear disc setup. Mark SC&C