If its an ED, it will have a rectangular log type plenum chamber for the intake. EF will have scroll type.
The conversion could be done, depending on what you consider easy. Its EFI so you'd need to mount the EEC somewhere, ge tits wiring loom, electric fuel pump, get around the smartlock - basically EEV needs a code from ignition before starting.
Then the trans, if you also take say the Falcons 4spd auto, probably custom driveshaft and somehow convert the electronic speedo sender to the old style cable drive.
Id say its a longish term project, requiring a bit of planning and gathering of knowledge/components. I have seen 60's 'Stangs with the xflow injected motors in the US, but the later OHC donk will be harder.