The last post is a good start but there are too many unanswered questions to comment on flat top v. dish, like is this a normally aspirated engine? Are you running an aftermarket cam, if so what kind of lift, duration, overlap? What about lash caps? The only parts advice I could offer, given the limited information, is that I found a good deal on play-dough (is that the spelling?) at Walmart. Trust me, you will need it if you build a serious engine.