What else do I need to convert to EFI

[Pawned]

71 Duster 318 4bbl
For an EFI system what do I absolutely need that I do not already have? What type of costs for what I do not have?
I have the MSD electronic ignition system
Fairly new fuel tank.
Edelbrock 1406 (4bbl) with a new aluminum intake manifold
I still have the old cast iron 2bbl intake manifold.

 

[Johnny Mac]

several options and ways to accomplish this.
one of these...
FTH-30003 - FiTech Go Street 4 Injector 400 HP Carb Swap EFI System with Cast Finish (won't do timing control)
FTH-30002 - FiTech Fuel Injection 30002 Go EFI 4 600 HP Basic Kit - Matte Black Finish
Holley Sniper EFI Self-Tuning Kit Holley Performance 550-510 - Pace Performance Parts

plus one of these pending your preference.

FTH-40005 - FiTech Fuel Injection Inline Frame Mount Fuel Delivery Kit - Master Fuel Kit
FTH-40003 - FiTech Fuel Injection Fuel Command Center - Platinum Grey Finish (Sump Tank)
Aeromotive - AEI - AEI18688 - Phantom Stealth Fuel System

possibly this, if you go the timing control route.
Adjustable Race Rotor MSD Ignition 84211 - Pace Performance Parts

several preference based variables here.

One of the efi units, plus your pump of choice will play nice with your MSD, so this should set you up.