I'm sure you have to use an aftermarket block to achieve 454, such as an SVO.
Now imagine 500 cubes spinning to 8000 RPM.
(Sorry, I know this is a Cleveland forum, but they are blood-brothers).
"No officer, it's just a 351 with a hole in the exhaust"
"While a stock block can be built to be reliable, if you're planning a serious effort with high horsepower and high rpm's, it's time to look at an SVO block. SVO's 4-bolt 351W block can safely handle 1300+ horsepower and is the end-all to durability concerns. There has been much talk as to how much rpm the large journals of a 351W can endure. Some people say that bearing failure is inevitable above 6500 rpm and others say it is even lower. We've found that as long as there is adequate oil pressure and volume, the 351W is happy spinning at rpms as high as 8500. The main journals are larger than most small blocks, but they're smaller than many big blocks, and it's not uncommon to see 500 cubic inchers spinning to 8000+ rpm. Don't be afraid of buzzing your stroked Windsor as long as your oiling system and valve train is up to the task. Circle track racers routinely see 8500 rpm with their 351W's."