So I need a new engine for my Jaguar XF 2009 premium and I was thinking to buy a 2009 xf 4.2 supercharged what all will I need to buy for it to go well?

 

A very big bank balance

Seriously - it's v complex and expensive to change. Not just a straight swap. They have lots of different parts attached, control modules and circuitry. Possible - yes. Economic - no

Better to sell the old car and buy a SC model

 

Have to agree. Unless you can do ALL the work I would sell your current car and get the car you want.
Not practical to do all those changes/modifications.
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