Hi Guys; I am changing my oil pump in my small block chevy. I purchased a Melling M55HV pump and S-55 screen assemb. The problem is I have a 7 Qt. pan and the screen does not go down even as deep as the stock chevy pump-screen. Should the screen be installed deeper in the pan?If so the screen is no longer flat that does not seen right. What am I missing?? Thanks for your help!