I believe the 01E is even stronger than the boxster 6 speed. It's what I'm going to use in my mid engine 911. I'm shooting for 650-700hp 2.7T in a 2500lbs car. If you're only hoping for 330hp/280tq, the 5 speed should work. You may want to hold onto the wire harness if you can. You never know what you might need off it. Jon had to buy one from me to get his ac working.
http://986forum.com/forums/show-tell-gallery/54328-boxsterls376-introduction-ls3-conversion.html