3.1L to 3.8L or 3.5L engine swap

[butchfig8]

Have 2003 Grand Prix needs new motor , is J code 3.1L
Can this be swapped with a 3.8L or 3.5L ??, use whole cradle with trans ??
And engine computer ??
How about wires ??

 

[dpzelenak]

do the 3.5, go to Milzy Motorsports or give them a call. they a a whole kit that swaps the 3100 to the 3500, wiring harness, mounts everything you need