Re: Xy/xw 5.4
Hi Jynx13, welcome to ford forums.
If it is a long term project, get him to focus on the bodywork and then the interior. That way, if he looses interest, he doesn't have as much $$ outlayed.
IMO, the windsor out of the AU would be the way to go to start with.
The BA XR8 conversion would be very expensive and would require a lot of development work to get round a few issues, like drive by wire.
'67 Mustang V8 4sp... what fun to drive!