Most go with the new axle and larger drum setups these days.
Way back, a lot of folks had their SBC axles plugged and redrilled to 4-1/2" BC. As you can see here, the redrilled 1/2"-20 R holes get close to the edge of the stock flange. The redrilled holes need to be perfect on the locations or you'll likely have issues.......
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You'd also need to redrill the drums. The hole location is not quite as critical as the axles as the register will locate it.........
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FWIW, Moser sells stock length BBC axles for the 10" X 1-3/4" drum set up. A thicker flange compared to the stocker.........
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