help with hatch

sup guys its mike in va, and i gotta few questions for anyone, i have a civic hatchback cx with only a 1.5 in it with a 4 speed, but i think that the 4 speed is geared quicker than the 5 speed, i was wondering if anyone new if the 4 speed would bolt onto the 1.6 si motor. also i need to know if a dohc head would bolt onto the 1.6 litre as well. well hit me back,

mike
aka: hatchin