Brakes
The only to really improve brakes to to go larger in diameter rotors.
While putting alloy calipers and ventet disce with quality pads may improve you are still running the original 11 1/2" rotor diameter.
If you put 14" front & 13 1/2" rear rotors on with 6 piston alloy front calipers with 4 piston alloy rear calipers the brake improvement is extensive.
You can buy these kits as a bolt on no modifications. However due to the larger diameter of the rotors you will have to go to a 18" rim.
It is also recommended that you reface your rear spindles and front hubs to maintain zero runout of the rotors. Original barke master cylinder and booster is retained.
Possible reinforcing of the front lower control arms may be required for extreme brake use.