why not do it the other way round fit a mx5 engine or 2.0 duratec same lump with 6 speed mazda mx5 gearbox or the older 5 speed an fit it up to a escort it will fit its been done many times keeps everything looking correct from the outside and retain the chassis and floorpans etc  some tunnel mods are needed live axles are robust enough for mx5 power if you upgrade the suspention it will handle too you only issue will be if you want to modernise the escort with up to date items but im sure with enough time and enthusiasm you will get past it