8 3/4 Rear End Needed for my 66 Dart

Im looking for a 8 3/4 complete rear end that will bolt right in too my 43" spring perches. Im building this car too raise money for the Childrens Merical Network thru fund raisers.Money is tight but im sure it isnt gonna be cheap. If anyone has any ideas or can help me locate one it would be very much appreciated.

Thank you for reading

Craig