Ahhhh Ok I got it - That Im not sure of because mine is a Lariat already. I would think that the connector would work but I would check out this thread tho for a non Lariat -
How To: Sync 3/4 swap for non Sync 3 XL/XLT
No, you can't get full coverage on a vehicle that was totaled and declared a salvage car:. You can get liability and uninsured motorist. So..... Generally the vehicle will be worth 40% less, hard to finance and no factory warranty. Depends on price but usually salvage title is best for cars...