Witch tranny to use for the sohc zc motor??

I have a sohc zc motor in my 90 crx, and i want to know what is the best tranny for use with this motor. I've heard from different sources that i should use the zc tranny others told me to use the si tranny. I was told that the zc tranny is geared higher than the si one. but i don't know for sure, does anyone know for sure whitch tranny i should use. some one let me know asap. thanks
jason