BHP of ZC dual carb engine

[hondarulz]

Hi all,

i have a 1988 model Grand Civic..... this originally came with a 1.5L(D15B) single carb engine. after i bought the car and i replaced the engine with a 1.6L dual carb engine..... the engine number is ZC series.....

what i want to know is the horse power of my current engine.... and another problem is i'm running with my previos gear box. thus cant get the maximum power from the engine. i want to change the gear box. i was looking for a gear box for this engine but couldnt find any coz all were auto gear boxes..... anyway does anyone have any clue how i can change my gear box as in the ratios of the wheels so that i can do a Mod....
:d

cheers............. HondaRulz