Can i use the standard efi system with the mega jolt ignition or will i need something to control the injetion of fuel or is it injected a constant pressure

I believe the thing to do here is to keep all of the hardware except the ECU and then control fuel and sparks from a Megasquirt n edis.
The standard ford brain would have a hissy fit if you wanted it to get on with a MJLJ.