Reply to "Bud Moore Block?"

This is an interesting discussion. I have heard before from several sources that the "good" block is about 20 pounds heavier. I am looking at the pictures and the only difference that I see is the solid pan rails.
I have read and heard also that the bulkheads are thicker. One source told me that the cylinder liners are thicker as well. My machinest is very experienced in Cleveland blocks and is a Motorsport distributor as well.
I asked him if the NASCAR block can be bored more then the production Cleveland and he said no. He also said that it requires the same prep for racing as the production block does. I know that includes at least sleeving the lifter bores to restrict oil to the valve train.
I have an Australian D2AE-CA block. When I had it bored by another machinest he wanted to charge me double. It was more difficult to bore and he suggested that in the future I might be happier with another machinest. The production US blocks are said to be softer and the cylinder can be bored in one pass. The Australian block cannot.
I think that there is a problem with the terminology. Maybe a big problem? People are refering to the Australian block meaning the NASCAR block.
The Australian version of the Cleveland is a production block like the US block. The NASCAR block is not a production block, it is a race block. The NASCAR block was also offered by Ford Motorsport as the A3 block for a short period in the early 80's.
The reality is that each will hold a certain amount of horsepower for a certain amount of time and then break. The debate is over how much horsepower and how soon it will break.
Nascar engines I believe are in the 800hp area.
Also remember that it was the 4 bolt Boss 351 production block that was run in NHRA Pro stock by the likes of Gapp & Roush, Don Nicholson and others, 9,000rpm power shifts and all. It can't be all bad.
How many of us are running under those conditions?