Drilling axels and drums from SBP to LBP ??

I,d like to maintain my power drum brakes(5x4 sbp)on my 68 Barracuda.I have some(5x4.5)Cop rims I,d like to put on the car.Who has drilled the front drums,rear axels and drums?Was it an easy job doing the fronts?Removing the axels to be drilled isn,t hard for me,but have never seen the front drums done.Any help or pics of anybody doing this conversion would help.Thanks