
Most American Labs seem to come from English lines.
The oversized Labs are not correct in any country and often with the oversize issue you also have hip and elbow troubles .... because people who are not breeding to the standard generally don't care enough to health check.
There are however larger Labs available from good breeders - some are simply bigger dogs - just as some people are bigger than others.
I would suggest contacting the Lab Club and asking for details of breeders in your area and chatting with some experts.
Labs are NOT supposed to e very large dogs - if your heart is set on a very big dog - why not start to look at other breeds that may suit you better?