cam?????

can it be done on a tec ohh50????? and which way should i turn the cam? the ohh50 is stock comp., stock cam, stock ign timing. only mods are: 26mm keihin carb that is 22mm on the intake manifold side, w/#35 pilot jet and #90 main jet. intake manifold ported out to 22mm, also a 8 inch pipe w/...