i also have the dohc zc in my rex, and well....it's fun.....however i am also at a bit of a loss for gaskets, seal's, an such.......check out d-series.org thay got a section on the forum dedicated to the zc http://www.d-series.org/forums/forumdisplay.php?f=10
from what i've read...any d-series trans shound bolt up......but also from what i've read...your gonna wanna find a si trans
also check out http://www.thezcr.com/forums/