[joyridin']

If you plan on driving the car a lot, I would stick the engine in a FFR. Who cares? It can always be taken out and replaced with something else later. It would be a lot of work, but just messing with that engine in anything is going to be a lot of work.

FFR's are easy to fix, have a lot of parts readily available, are cheap and easy to modify, and now with the new Mk IV body, look pretty close to an original in shape. And using many Mustang parts, are easily upgradable should you thrash it a bit and blow out the rear axle. It really just depends on what you plan on doing with it.