You can see all of my engine mods in my sig. Close to 400RWHP. Since you have a smaller fuel injection pump, you will need a few more parts to get the same power I have. One thing I still need to get, is a 3k GSK, so the fuel injection pump doesn't defuel so early. Would suggest a kit for yours as well.
ATS, DTT, Goerend, Suncoast all make great trannys. I do think you will get the best bang for the buck with a Goerend transmission. Build a quality product, with superb customer service (before and after the sale). All transmissions and torque convertors are built to order, and built in house. Been VERY happy with mine. Have almost 30k miles on mine, and no troubles with it at all.
www.goerend.com