Just for fun; earlier I mentioned my street car making factory 2.2HP / CI and 274HP. This is a sedan, running 87 octane, 11 + compression and 17 pounds of boost.
Now imagine back in the day if, say a 327 could make 2.2HP / CI? That would be 719HP...
A very few actually did-in Jr. Fuelers on injection and nitro...