With PAL->NTSC (assuming progressive source anyway), you just re-encode as 23.976 in CCE and then run pulldown on the file.
Anyway, if you've done it this way, using besweet's 25->23.976 frame rate change should be fine. I know from experience

It's best to do this operation with AC3->6 wavs and then use a commercial AC3 encoder (softencode, surcode, acid plugin, etc) to re-encode those wavs to a 5.1 AC3.