Hi Jim!
I am confused by your comment about small blocks not being in 'muscle' cars. The engine results I posted were all used in the various commercial presentations of the Z and Boss cars with the exception of the 327 and 289.
The magazine restricting the 'marques' to Ford and Chev is not a problem. This thread IS Chev vs Ford, so, no problem.
Regarding how high an engine will rev we need to keep things in perspective. Drag race cars hit their rev limits for fractions of a second. Road race cars hit theirs over and over again for hours. The current NASCAR engines qualify as 'small blocks' since they are 358 cid. They rev to 8,000 and 9,000 rpm over and over again for long stretches on the tri-ovals.
The C6 Corvette 427s are no longer big blocks. At the 24 hours of LeMans they keep hitting the red line shift after shift for 24 hours. On what is left of the Mulsanne they hold red line for over 2 miles (iirc).
If you want to hit 15,000rpm you need to go the the tiny-blocks. The 500-650cc japanese motorcycles do rev that high, but don't ask them to do that for a 24hr race.