Rear Drum Question

Some years ago I bought a pair of 8 3/4 axles that were redrilled for bbp. My thinking was change the axles and buy new 10" drums from a 73 up car and I'm on my way. Now I'm not so sure. My 8 3/4 has 10x1.75 shoes on it, and it looks like the 73 up shoes are 10x2.5. Am I missing something or is this more of a complicated mission than I thought.

I appreciate any expertise you can offer.