what car is it in, and what ecu are you running??? (this will determin obd1 or non obd)
also on a dohc zc, the dist bolt patern is way diff from an ls. on a sonc zc, yopu can get one bolt to line up tho. i'm not sure if you can get at least one ls bolt to line p and still be in the right position on a dohc.