Engine swap

I have a 2012 v6 mustang that ive modded and all ive needed is a v8 engine and recently got ahold of a gt 3v engine just wanted to know if there would be any problems with swapping the motors or if any modifications are needed for the swap. Any help is appreciated
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Why do you want to swap a 3V into that car when it the V6 makes about the same power as the 3V did?

At any rate you would most likely need a full harness and ECM, and probably also make sure the fuel system is compatible among other things. TBH I don't know what the particulars would be but it would be pretty involved. Maybe someone else can chime in.