I believe you do Brent. The ability to turn those engine speeds is in large part head flow and valve train related. The FE engine style has a simpler. less massive valve train than a late model. High rpm is relative, 7500 on a hydraulic roller in an FE is flat impressive.
I was speaking to engine speeds that were 3000 to 4000 rpm higher in a race style engine. The ability to run those kinds of engine speeds and make power up there requires heads that flow differently. An intake port with a 600 cfm flow and a valve train that can produce power past 10,500 to 11,000 rpm is a different sort of engine that requires different springing and valvetrain components to perform at those speeds. When you start going down that path you are no longer building a street engine. Sometimes when you get what you wish for you wish you had not gotten it.
Don't misunderstand, I am flat impressed with what you have done — it is impressive, especially for these engines in street form with a hydraulic roller.
Ed