The timing shouldn,t be different and I don,t recall different pistons either. One thing on some of the engines like the D330 yours and others had a piston oil cooling jet from the block from a main bearing to spray the bottom of each piston to cool them.As you mentioned there are the manifolds and piping needed to install the turbo. The rack setting might be different and the RPMs and I don,t have a book high enough to give them to you but RPMs depends on what your going to use the engine for as there are so many different settings for them.