The engine will be fine , injectors etc are all Ford OE and are ethanol safe
What Morgan used to plumb the fuel lines with is anyone’s guess
They may have used ethanol safe hoses, or they may have used whatever they had on the shelf at the time
Your fuel tank is aluminium and may corrode internally as the ethanol can attack it- although I’m not sure at what percentage ethanol this will start to be an issue. Certainly E85 will…
2003 is potentially a change over year for the fuel tanks and pumps, the earlier pump is Honda (mounted on the sloping face of the back of the tank, secured by six bolts) and may pre date manufacturers testing fuel systems with ethanol. The latter pump is Ford ( mounted on top of the tank, and secured by a big plastic screw collar) and should be fine
