Oil cover is laying on Rocker Arms. Rocker Arms cant move...

What is your question?

I have a 1997 Pontiac Grand Prix GT V6 3800. I had to change the lifters pushrods and rocker arms. When I got it all back together I noticed the oil cover was laying directly on the rocker arms and the rocker arms are not moving. When I put the oil covers back on they were not lining up completely they were off about a quarter of an inch . I thought after I tighten them down it would straighten out but it did not . It's laying completely on top of the rocker arms . Would this keep the car from cranking?

What makes this problem better or worse?

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How long has your 1997 Pontiac Grand Prix had this problem?

Today after putting the car back together