New motor weird noise....

we got my new motor in today and it started making a clinking noise that sounded like it was coming from the valve cover. I started talking to some people and they said that since i put a .512 lift cam in there it is making my rocker arms hit the baffles is this possible? thanks
 
Oh yeah I had to grind mine down today when I did the install cause the covers wouldn't even sit right..worked well but a pain in the ass. I put my motor in and had some serious tapping..my fear was having to tear her apart then start over, but it sorted it self out after about 3-4 minutes running.
 
well we pulled off the valve covers today and there are no valve caps on the valves, :mad: :mad: :mad: causing the rocker arms to be loose as hell. That is what was tapping around. The maching shop is getting a nice call in the morning. Do these just slide on? or do they require head removal?