what do I do now

There is an X on the head, that's about It. All AAWJ360 heads (on runner) are so close in castings that there no discernable difference in performance when measuring like valve heads. The can all take a 2.02 intake valve but if you have mid cam, the 1.88 intake works better o the street. J, O and even Z heads are All 'bout the same as an X.