360-1 Casting better?

What about the Brazilian 318s that we in Australia got in the late seventies. I have a 318 dated 1978 and on the side of the block is cast in "made in Brazil" By all accounts my machinist says he sonic checked one and found a much thicker bore! I also know a guy who worked for chrysler in the USA and also chrysler Australia and he says yes these blocks were a lot better than the USA blocks.