"It's been said" that the early 360 blocks had more meat around the cylinders due to the factory still using 340 water jacket cores when they cast the 360 blocks the first couple years. More dimensionally stable, and possible bigger overbore- but you'd still need to have it checked to confirm a big bore.
Roller blocks, other than a slightly different valley configuration to accommodate the lifter retaining spider, also had taller lifter bores; which can be helpful in keeping some lifters from exposing their oil grooves with high lift cams or with some aftermarket retrofit roller lifters.