I believe it has something to do with the lower compression in the 73+ engines that made the rpm range lower, I remember watching pete's garage on his 440 build that he mentioned something about the ranges.
That doesn't apply when you rebuild the engine using different parts. When you change all of the parts the rpm range will also change. Bottom line what you are trying to accomplish is very easy for someone who has experience building these engines. You just need to make sure that whoever you work with to build the engine understands what you want since most guys building 500 inch stroker engines are looking for a street/strip type of build. For your engine the proper parts need to be selected. This won't be an issue for an experienced engine builder since the parts you need all exist.
