[Hexnut72]

If it is an original car I can see the blasphemy.

On a replica, it is never going to be an original, so why worry? Do you have a Salsbury rear? Armstrong shocks? Girling brakes? What brand are your gauges? How many gears are in your trans? What is the name on your fuel pump? Is the body made out of Aluminum? Do you have a 90" wheelbase? Round tube chassis? Is the body an exact copy or just "period correct" or something that might be an MG (or Healy or a Cobra or a ...)? So many places you can go wrong that no one seems to make a fuss about.

If you are trying to build an exact replica, good on you for choosing a Ford engine. If it isn't exact, why stress about where the engine came from? Does it make the car go and put a smile on YOUR face? Do it!