Here's my Grandmother's (born 1887) recipe for corn bread dressing.  It was never placed in the turkey, but cooked separately.  I love it with mashed 'taters covered with giblet gravy. Modified slightly by Sharn Jean.
CORNBREAD DRESSING
Ingredients for cornbread 
2 cups yellow corn meal
2 cups flour
2 Tbs baking powder
2 and 1/2 cups milk
1 tsp. salt
2 eggs
1/2 cup vegetable oil 
Mix ingredients in a mixing bowl; pour into a greased, 9X13" cake pan. Place into a preheated 400 degree oven and bake for 30 to 35 minutes. Cool; crumble and allow to dry for a couple of days. 
Ingredients for Stuffing
Dry Cornbread (above)
1-14oz package of Seasoned Bread Stuffing Mix (Sharn Jean uses Pepperidge Farm)
2 cups chopped celery
2 cups chopped onion
2 cups chicken broth
2 cups (approximate) turkey broth/drippings
Salt, pepper and 
sage to taste 
Heat onion, celery and chicken broth in a sauce pan until celery is tender. Mix cornbread and bread stuffing mix in a large bowl; add onion/celery/chicken broth.
 
Add turkey drippings to effect a wet (but not soupy) mix; add salt, pepper and sage to taste. 
Add 3 eggs and mix well 
Place in a large pan, 3 or 4 inches deep.  Bake at 350 degrees for about 1 hour, until brown around edges and done in the center.  
Best served with giblet gravy.  
Note:  The boss says that the amount of celery, onion and seasoning (I like a lot of sage) is pretty much a personal preference, and you will have to adjust it to your own liking.  
GIBLET GRAVY
Ingredients 
Giblets from turkey...gizzard, neck, tail, heart (not liver)
2 or 3 eggs; boiled
2 cups chicken broth (approximate)
flour/water thickener
salt and pepper 
Cook the giblets in sauce pan in about 2 cups of chicken broth until done (about an hour or so).  Remove giblets, drain and allow to cool.  Strain the broth. 
Boil eggs until done; slice/dice.
Cut up giblets; tease any meat from the neck.  Discard the tail
Add turkey drippings and/or chicken broth to make however much gravy you want.  Bring to a boil; add the flour/water thickening until it is the right consistency. Add the eggs, giblets and seasoning to taste.