I think the mechanic just bit off more than he could chew.
What made them think they could even do the job in the first place? I don't even recall anyone on our forums since 2002 doing anything this extensive.
I've heard about one or two people who have done this swap before so if anyone has I would love to pick their brains. I'll add some more photos if anyone is curious of what I'm working with. All comments are welcome.
They weren't here or on any other related forums. It's been discussed here as far back as 2006 and one of the guys at the Ford plant said "I spoke with an Engineer from the Lima Engine Plant where the engines were to be built. He said the Jaguar uses a Denso control box (computer) while the Thunderbird uses a "Black Oak" box. he said they spent
"HUGE" amounts of time to get the Denso box to talk to the Black Oak box. The Blown Bird was to use the Denzo box to control the engine while the Black Oak box would control the Traction Control, several sensors, the drive-by-wire systems, etc. " You will note when you posted on the jag forums, the person said the same concern about the computers.
Also, an explanation here-
https://forums.fordthunderbirdforum.com/threads/adding-a-supercharger-to-a-2003.5589/post-34038
If you get the car running, I will be amazed. Anyone who has successfully done this would have probably done it in a high-end custom shop, like the ones you see on television!
This has been done on the Lincoln LS and the shop that did it has several videos, so it may help get you in the right direction. As you can see from his posts over 1+ year, it's not straight forward at all.
BUILT FOR FUN
www.youtube.com
Discussed swapping with a remanufactured engine or a coyote but the Jaguar engine was by far the quickest/cheapest option. $3,652 for the swap and $1,096 for the brake kit.
This turned out to be untrue. The mechanic better be glad I'm not the customer, I'd 100% file a law suit. It's one thing to swap engines on cars like Mustang, but trying to swap out a Jaguar Engine from 20 years ago when pretty much nobody has done it is completely asinine, especially for 3600 bucks. No rational thinking business would have even suggested doing this.
FYI Ford Purchased Jaguar in 1989 and sold it in 2008. This whole mess with Jaguar was a very short stint with the engines in the Tbird & Lincoln LS.