Pretty much all real high HP numbers will come from blown motors.... the only thing you'll see on an NHRA strip is blown....
But that does not mean people do not make big HP on NA, but even there, you'll see a shot of Nitrous boosing the numbers claimed to be NA in Mag articles... NOS bottles hidden in the doors of Gen I cars were classic
Package cars out there now:
RSI: Gen III 750 HP, Gen II 800HP
DC Performance, similar packages/numbers
West Coast Viper: Gen II/III 725 HP (dry sump racing engines)
TNT: Gen II/III 655 HP
Archer, Albert, Macedo .... all have big HP NA packages too
Big Daddy's were the NA engines in the GTS-R cars.... right up there with some forced induction cars.
Several here have made some pretty sweet NA engines in their own shops.