If you do find out a 4.6 DOHC will fit, give us a call and I will hook you up with the guys who are building our 4.6 DOHC for the new display car. They build from the block up and can give you stock injection, stack injection (used in our display car), carb (yes, I said carb), blower or any other combination. The prices are great and the workmanship is top-shelf. We actually offer a 4.6 DOHC / (carb or stock injection) / Tremec 5-Speed drop-in package for $12,900 ready to run and they build it. Let me know, they can probably do better on price than the Ford package.
--Mike / Turn Ten Racing, Inc.