Lots of variables to consider biggest being the differences in pump gas that's available out there, there WILL be a power difference in different brands of fuel. Next I would think being able to keep the water and oil temps under control would be another problem. Extra heat is going to make it more detonation prone, so I would imagine that would be a big concern. Next the RPM level you are looking at will create more heat inherently. Im not sure anyone has ever built a pump gas large non boosted automotive V8 type engine for that type of rpm. The parts needed to simply achieve that RPM are not generally whats seen in pump gas type mills. 10,000rpm is a LOT of RPM to be sure. We spin the heads up motor a little harder than that. We do it on a 100 octane fuel as well. However that fuel is HIGHLY oxygenated and of course leaded. FWIW that engine used to be an unleaded pump gas SB engine back when the car went 8.80's