Alright lets do this:
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Technically if you were to stay on a 3.6 psi spring (turbo) the stock fuel system can handle that. So that would mean you really only need a turbo kit. Now most people couldn't keep a 3.6 psi spring for a week if life depended on it so.
Injectors
*most common 39lb/blue/03 cobra stock injectors
Fuel pump
*most comon "255 svt focus pump"
That + turbo kit or supercharger kit = as much as you really need.
To go past that to be some what reliable:
- 8.8 rear end
- Clutch (if your 5speed car)
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Then if you get bored, or blow a motor you can forge the bottom end.
At which point you can turn the boost up, then your fuel pump may or may not keep up (same with injectors)
Which means
60# injectors
and
KB boost a pump
(if thats not enough fuel)
03 cobra tank or pumps + boost a pump
IF THAT'S NOT ENOUGH FUEL TO MAKE YOU HAPPY PREPARE TO SPEND SOME BIG $ ON FUEL MODS

(or go return style)