That's like saying you're still using grandpa's old axe, when the handle has been replaced 5 times and the blade replaced 3. It's not grandpa's old axe any more.
The 4l Barra was, and remains, an awesome engine. Ppl are getting 1000+ HP from them. In terms of straight 6s, they're absolutely up there with the RB26T and the BMW straight 6 of the time. Considering FoA had pennies to develop it, it's an amazing engine.
Ford would have done well to utilise it across the pond. Would have made a great Jag engine.