Dave,
I might have missed it where you answered this, but what motor did you tell FF5 you were using when you ordered the kit?

In other words, are those the 4.6 specific motor mounts welded onto the frame?
You order a kit for the 4.6. The motor mounts on the frame are the same, but the motor mounts you get for the kit are different. There is also some different aluminum included for the drivers side footbox as Sergio pointed out earlier in the thread.

The headers you would want to get to modify for the 5.0 would be the standard 4.6 Headers. Same spacing but different flange. Still some work but definately doable.

David