Need advice. Has anybody used Proform 1.6 Roller Rockers? I just put on a set and they sit high. Stock valve cover won't fit. It's about 2 1/4 inches high. I'm thinking about putting a 3/8 or 1/2 spacer on the stock intake. Is there a valve cover that's about 2 1/2" high? I also have an option to install an Explorer intake with a 3/8" spacer. but I would have to use an Edelbrock elbow adapter. Has anybody done this? Maybe that would give me more room under the plenum?