On Mace's 10psi pulley upgrade it says 98 octane fuel is required, how do these go against the LS1 engines?

Between traffic lights on the street at legal limits, lots or cars would struggle to keep up with an L67 powered Commodore with mild bolt on mods, LS1 powered Commodores included. This is due to the fact L67's have a strong bottom to mid range power band.