hi guys i have a 1990 xr3i efi cabriolet and i went and bought an mfi engine with the wiring ecu,fuel module ,exhuast,

so i have a dead efi engine and a working mfi engine and i have the both sets of wirng for both engines efi is still in the car and the mfi ones i am trying to clean up as much as i can but to be honest i really dont know what i am doing

the car was never supposed to be a project so i am a bit annoyed at having no car especially the cab would just like to know where to go what to do if people can help me ill be most grateful thx man