rocker arm upgrade

[chiaronate]

hi guys. i've been thinking of changing the rocker arms on my '94 gt mustang. i think stock rockers are 1.6 ratio, correct me if i'm wrong. i thought i'd get 1.7's, and was wondering if i would have to change anything else. any idea of how much horsepower increase? would my torque peak be at a different rpm? would 1.7's affect lobe separation? these questions probably sound dumb, but i really am cam iliterate. any help would be appreciated, thanks.