He'll just have to get the intake and gaskets for the 4.6 PI Mustang along with the coolant tube, there's nothing special involved, it's a standard PI swap.
2001 Dark Highland Green Bullitt
12.25@110 naturally aspirated on a bone stock 2V longblock
Under Reconstruction for RS275 Drag Radial Class
Pushrods and Powerglide Coming Soon
If it weren't for physics and law enforcement, I'd be unstoppable.