Hey guys just pulled my 25 hp evinrude 2 cylinder single carb engine down to give it a new set of rings and so on

also looking for a new lower unit for it

im looking at doing a little bit of mod work to the engine and i was thinking about opening up the exhaust and the inlet ports a fraction and also to have the exhaust come out of the top of the mid section

im just a little worried about the carby being able to keep up with the small mods

if anyone could help that would be great cheers