The 25 didn't get that Gearcase and Transom Bracket till a few years laterWelcome to iboats!
Intakes are on either side of the gearcase.
The black rectangle in the picture above the prop and below the anti-cavitation plate.
View attachment 402219
Thank youThose are Water Inlets, for when the Engine running in Reverse. In reverse, the Prop is pulling Water Away from the Regular Water Inlets, which are on the Front of the Exhaust Snout