The D shaped combustion chamber isn't a requirement. If you use an open chamber head (heart shaped chamber), the compression ration will drop a bit. Equip the head with either the factory inconel exhaust valves, or at the very least some stainless steel ones. DO NOT use the standard duty valves. If the valves from your existing head are still good, take them to the machine shop with the head you're going to use and have them installed with a good valve job. Turbo heads are prone to cracking the castings through the exhaust valve seats. If you have minor cracking, you may be able to have your machine shop install valve seat inserts. When they do, they'll actually machine out the area that's cracked, and press in the new inserts. This is one way to pontentially save a head. You're machine shop should be able to tell you if it can be saved. May want to try more than one shop, depending upon their experience with 2.3T heads.