You'd probably get a few more horses but only at the top end. The 24v was tuned for a relatively flat torque curve to assist in low speed tractability. Narrower intake dimensions assist in low speed torque as airflow velocity is increased; of course at some point you restrict top end power. Increasing intake port diameter could actually reduce low speed torque.
Interesting, and makes sense now I think about it, otherwise there'd be no need for twin plenums on some normally aspirated performance cars. It'd follow the same would apply to turbocharged cars too, smaller intake ports would assist low-end torque and at mid-range onwards the forced induction would take care of airflow, which explains why most road-going turbo cars have relatively restrictive inlet manifolds.