The Ford 302 engine has been around since the 70's. I really think they have the bugs worked out.
The new design is more a refinement, with direct fuel injection coming soon to some of the V8's, to provide even more fuel economy, and better mileage. Right now, I think it is still port fuel injection, something Ford has had since at least 1987. It is a great motor, with more than 150,000 miles expected before considering a rebuild. Many engines have well over 200,000 trouble free miles on them. Check any Home Depot, and you will find a parking lot full of Fords each weekday, picking up parts.
Fred.