97 GT to Cobra engine and trans swap

Hey guys im thinking about swaping a cobra motor and trans into my car out of either a 96-98 or 99-03

i have a few questions one which would be easier?

if i go with the 96-98 cobra engine and trans with everything bolt right up?

what all will i need besides the engine, trans, computer and harness

does anyone know of a good place to get the motor trans and everything else i need for a decent price?

if you have anything else to add please feel free.
 
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