8.75 Axle swap 4.0inch to 4.5inch Brake Questions

When converting 4-inch to 4.5-inch Axles on an A-body 8.75, What is the best scenario with the brakes, it currently has the 10inch drum! I have seen others talk that drilling the Drums for 4.5, or can I use 4.5 10-inch drums from an 8.75 truck or B-body using my current backing plate on my 71 A-body 8.75 once the Axles are changed?

Thanks, Jason