727 valve body

Need help one more time.... my 68 car has a 81 727 in it with a reverse valve body, I want to go back to a regular valve body with a good shiftkit ( I don't mind changing ujoints every fall ). My question is can I use a valve body out of an older transmission or does it have to be from a 1981 trans. It could be hard to find a vb from one year..... thanks for responding inadvanceScreenshot_20220301-193939_Samsung Internet.jpg