I swapped mine. It was an 02 3.8l, but i found a dealon a 2000 GT complete drivetrain. If you do the swap it's ok, but if not you'll end up spending about 3k just for labor of the trans, motor, and rear end. Those are the easy parts. You need obviously engine, complete wiring harness, body harness, exhaust, cooling, ecu, rear end, trans, driveshaft, ohh k member too. Plan on spending around 4k for parts. Ohh one more piece of advice and my only painful mistake, iwish I had found a late 01-04 since the fog lights switch changed as well as some of the other little things. Good luck and afterwards you'd be happy but ultimately buy a GT and you'll have more $ to your name and less hadtle, it was fun sure but also expensive but my car had that sentimental value since she was my first.
2002 True Blue V6 to GT Vert
16.1@86 as an auto 3.8
2.15 60', 9.3@77, 14.4@96 as a 5spd SOHC 4.6