S13 front coiovers will work up front if you use AE86/KE70 camber tops on them and also use S13 LCA's, hubs, brakes, etc.
As for the rear, your best using sierra shocks with cut falcon springs. Unless you want to do extensive mods to your car, you wont get rear coilover in there.
Fuel wise, you can use all of that stuff, however I JUST run a VL fuel pump, nothing else and it works fine. Expect a healthy bigport to be making around 68kW at the wheels.